FAQs on Multi-Select Lookup (MxN) Field in Zoho CRM

FAQs on Multi-Select Lookup (MxN) Field in Zoho CRM

 Nearing 200th Kaizen Post – We want to hear from you!
Do you have any questions, suggestions, or topics you would like us to cover in future posts? Your insights and suggestions help us shape future content and make this series better for everyone. 

Hey everybody!!!
Welcome back to another post in the Kaizen series!
In this post, we will address some of the most frequently asked questions about the Multi-Select Lookup(MxN) field from the Zoho CRM developer community forum.

1. What is a Multi-select lookup field?

A multi-select lookup field in Zoho CRM lets you create a many-to-many relationship between two modules. This means a record in one module can be linked to multiple records in another module and vice versa.
For example, using an multi-select lookup field, you can associate multiple skills with an employee.

2. How does the Mutli-Select Lookup relationship work?

When you create a Multi-Select Lookup between two modules, for example, Employees and Skills, Zoho CRM automatically creates a hidden linking module, which is also known as an MxN module. This module stores the associations between records in the two modules, enabling you to track and manage many-to-many relationships.

For instance, if you link Employees and Skills, a linking module named EmpXSkills will be created.

This linking module is accessible only via API.

Backend Flow of multi-select lookup Relationship



In the linking module, two lookup fields (lookup fields with api names - Employees and Skills) will be created. The lookup fields, one pointing to Employees and the other pointing to Skills from the linking module, establish a connection between the linking module and its associated module.

Why you cannot use a lookup field for this use case? 
In Zoho CRM, a lookup field creates a one-to-many relationship between two modules i.e. one record in the source module can be linked to only one record in the target module.

Example :
If you create a lookup field for Skills in the Employees module, each employee can be linked to only one skill. So, use a multi-select lookup field instead of a lookup field when you need to represent complex relationships like one employee - many skills and one skill - many employees.

3. How to create a multi-select Lookup field using Zoho CRM APIs?

To create a Multi-Select lookup field between two modules using Zoho CRM APIs, follow these steps:

Step 1: Identify the Module API Name
Before creating the field, you should know the API names of the Employees and Skills modules. For that, use the Get Module Metadata API.  

Request URL  : {{api-domain}}/crm/v8/settings/modules
Request method : GET



Now, search for the Employees module in the response and note its API name.

Step 2: Use the Create Custom Fields API

To establish a many-to-many relationship between two modules, in our case, Employees and Skills, you need to create a custom field of type multi-select lookup in the Employees module (parent module).  Here, we will associate multiple skills to an employee.

This custom field requires:
  • The related module you want to link to - Skills.
  • A display field from the related module
  • The linking module (EmpXSkills), which stores the actual associations.
Use the Create Custom Fields API to create custom fields.

Request URL : {{api_domain}}/crm/v8/settings/fields?module=Employees
Request method : POST

Sample input :



{
    "fields": [
        {
            "field_label": "Skills", //Name of the field in your module
            "data_type": "multiselectlookup", //Type of the field
            "multiselectlookup": { //This JSON object contains the multi-select lookup relationship details

                "connected_details": { //Details about the module and field you want to link
                    "module": {
                        "api_name": "Skills" //API name of the related module
                    },
                    "field": {
                        "field_label": "Skills" //The field in the related module to display
                    }
                },
                "linking_details": { //Details about the junction or linking module that manages the many-to-many relationship
                    "module": {
                        "plural_label": "EmpXSkills" //Plural label of the junction module
                    }
                }
            }
        }
    ]
}

4. How Do You Find the Linking Module and Field API Names?

To know the API name of the linking module:
Use the Get Modules API and search for "generated_type" : "linking" in the response to identify MxN modules. In our case, EmpXSkills.

Request URL : {{api_domain}}/crm/v8/settings/modules
Request method : GET



To know the field API names in the linking module:
Use the Get Fields Metadata API to retrieve the API names of lookup fields within the linking module.

Request URL : {{api_domain}}/crm/v8/settings/fields?module=EmpXSkills
Request method : GET

5. How do I associate records via a multi-select lookup field using the Insert Records API in Zoho CRM?

To associate records using a multi-select lookup field, you must provide the record IDs from the related module. The association is made through the linking module.

Example :
Associating multiple skills with an employee using the multi-select lookup field.

Request URL : {{api-domain}}/crm/v8/Employees
Request method : POST

Sample input :


{
  "data": [
    {
      "Name": "Patricia",
      "Email": "patricia@mail.com",
      "Position": "Marketing Specialist",
      "Year_of_Experience": 5,
      "Skills": [   // API name of the multi-select lookup field in the Employees module
        {
          "Skills": { // API name of the lookup field in the linking module pointing to the Skills module
            "name": "Marketing",
            "id": "5725767000002149427"  //ID from the Skills module are mandatory to establish the link
          }
        },
        {
          "Skills": {
            "name": "Social Media Marketing",
            "id": "5725767000002149476"
          }
        }
      ]
    }
  ]
}


6. How do I associate an Employee's skills using the linking module in Zoho CRM?

To establish a relationship between the Employees and Skills modules through the linking module, use the Insert Records API to create a record in the linking module, EmpXSkills.

To do this,
  • Use the appropriate lookup field API names to reference the parent module.
  • You must need the record IDs from both the Employees and Skills modules to create the associations.
Request URL : {{api-domain}}/crm/v8/EmpXSkills
Request method : POST

Sample input :


{
  "data": [
    {
      "Name": "Patricia",
      "Employees": {
        "id": "5725767000002161001"  // Record ID from the Employees module
      },
      "Skills": {
        "id": "5725767000002149476"  // Record ID from the Skills module
      }
    }
  ]
}


7. When should I use create/update operations in the Employees module vs the EmpXSkills module?

                Employees Module

               EmpXSkills (linking) Module

Use when you want to create or update an Employee and associate Skills using the Multi-select Lookup field.

Use when you want to create or remove associations between existing Employee and Skill records without modifying the actual Employee or Skill data.

Creating a new employee and assigning their skills at once.

Managing relationships between existing records i.e., linking and unlinking skills to employees.


8. How to update a record in the linking module?

To update a record in the linking module, use the Update Records API.
Request URL : {{api-domain}}/crm/v8/EmpXSkills/5725767000006269044
Request method : PUT

Sample input :


{
    "data": [
        {
            "Skills": {
                "name": "Marketing",
                "id": "5725767000002170035" //Associating another skill with the employee 
            }
        }
    ]
}
In the above sample, we have replaced an existing skill associated with an employee with another Skill in the linking module.This is done by updating the Skills lookup field in the EmpXSkills record.

Please note that in the linking module, Skills is a lookup field, so you can associate only one skill per linking record. But in the Employees module, Skills is a multi-select lookup field, so an employee can be associated with multiple skills.

9. How to unlink records from the parent module as well as the linking module?

Unlink the associated records from the parent module:

Using the Update records API, you can remove an associated skill from an employee, use the "_delete": null key within the multi-select lookup field in the Employee record update.

Request URL : {{api-domain}}/crm/v8/Employees/5725767000006269044
Request method : PUT

Sample input :

{
"data": [
        {
            "Skills": [
               {
                    "Skills": {
                        "name": "Marketing", 
                        "id": "5725767000002170035" // The Skill record you want to unlink
                    },
                    "id": "5725767000007228047", //record ID - The record created in the linking module for the employee with the Marketing skill
                    "_delete" : null 
                }
            ]
        }
    ]
}

Replace an associated record from the linking module:

Use the Update Records API to replace an existing association in the linking module.

Request URL : {{api-domain}}/crm/v8/EmpXSkills/5725767000007228035
Request method : PUT

Sample input :


{
    "data": [
        {
            "Skills": {
                "name": "Java",
                "id": "5725767000005259075" //replacing a new skill 
            }
        }
    ]
}
In the above sample, we have replaced the existing skill with Java.

10. Why am I seeing the error "DUPLICATE_LINKING_DATA"  in the Update Records API? 

This error occurs when you try to associate records with the parent record that are already linked with the Multi-select lookup field. To resolve this, check the records you are trying to link and make sure your association is only with records that are not already linked.

Know your existing linked records:

Before the Update Records API, use the Get Related Records Data API and search for the multi-select lookup field. In our case, Skills is the multi-select lookup field created in the Employees module. This will return all records already associated.

Example :


The response returns all Skills already linked with that Employee.

Using this way, compare the IDs from the API response with the new records you are about to link, and only proceed with non-duplicate IDs. This avoids duplicate entries and prevents the "DUPLICATE_LINKING_DATA" error.

11. What happens if I delete a record in the linking module?

When you delete a record in the linking module, it only removes the association between the related records in the Employees and Skills modules.

Note :
  • Deleting a linking module record removes only the relationship between two records from the Employees and Skills modules.
  • Deleting an Employee or Skill record deletes all corresponding entries in the linking module as well.

12. How do I query linked records?

Use the COQL API to query multi-select lookup data by specifying the corresponding linking module's API name directly in your query. The linking module is treated as a separate module in Zoho CRM, so you can retrieve associated records by querying it like any other module.

Sample query :


{
  "select_query": "select Skills.Name as skill, Employees.Name as employee from EmpXSkills where Skills.Name like '%Marketing%'"
}

Use the Get Module Metadata API to know the linking module's API name.

13. How do I export multi-select lookup records using the Bulk Read API?

To export multi-select lookup data, linking module records efficiently, use the Bulk Read API with the linking module’s API name.

Request method : POST

Sample Request :


{
    "callback": {
        "method": "post"
    },
    "query": {
        "module": {
            "api_name": "EmpXSkills" //API name of the linking module
        },
        "fields": [
            "Employees.Name",
            "Employees.Year_of_Experience",
            "Skills.Name"
        ],
        "criteria": {
            "group": [
                {
                    "field": {
                        "api_name": "Employees.Year_of_Experience" 
                    },
                    "comparator": "greater_than",
                    "value": "4"
                },
                {
                    "field": {
                        "api_name": "Skills.Name"
                    },
                    "comparator": "contains",
                    "value": "Social"
                }
            ],
            "group_operator": "AND"
        }
    }
}

14. Can I import my linking module's data using the Bulk Write API?

Yes. Like the Leads and Contacts modules, you can also import linking module's data into Zoho CRM using the Bulk Write API by directly specifying the linking module’s API name.

If you are importing data that involves both a parent module, Employees and its associated MxN linking module, follow these steps:

1. Create separate CSV files:
  • One for the parent module - Employees
  • One for the linking module - EmpXSkills
2. Zip the files into a single ZIP file.
3. Upload the ZIP in a single Bulk Write API request.
4. Ensure accurate field mappings are provided in the API request body.

Refer to Kaizen #131 - Bulk Write for parent-child records using Scala SDK for more details on handling parent-child records.


15. Can I receive notifications if a multi-select lookup field in a module is modified or updated?

Yes, you can receive notifications when a MxN field is updated using the Notification API. To enable instant notifications for actions performed in a module, use the respective API names of the linking module in the input body.

Request method : POST

Sample input :


{
    "watch": [
        {
            "channel_id": "10000",
            "events": [
                "EmpXSkills.all"  //EmpXSkills represents the API name of the linking module
            ],
            "return_affected_field_values": true  
        }
    ]
}

16. Can I use criteria-based filtering when accessing multi-select lookup data using the Search API?

Yes, you can filter multi-select lookup data using the criteria parameter in the Search API's URL.

Here is an example that fetches records from the EmpXSkills linking module.

Request URL : {{api-name}}/crm/v8/EmpXSkills/search?criteria=((Secondary_Email:equals:patricia@mail.com)and(Skills:equals:Content_Marketing))
Request method : GET

Sample response :



                                                                                                                               x-----------------------------x


We trust that this post meets your needs and is helpful. Let us know your thoughts in the comment section or reach out to us at support@zohocrm.com 

Stay tuned for more insights in our upcoming Kaizen posts!


Other FAQs in the Kaizen series :


    • Sticky Posts

    • Kaizen #197: Frequently Asked Questions on GraphQL APIs

      🎊 Nearing 200th Kaizen Post – We want to hear from you! Do you have any questions, suggestions, or topics you would like us to cover in future posts? Your insights and suggestions help us shape future content and make this series better for everyone.

    • Kaizen #198: Using Client Script for Custom Validation in Blueprint

      Nearing 200th Kaizen Post – 1 More to the Big Two-Oh-Oh! Do you have any questions, suggestions, or topics you would like us to cover in future posts? Your insights and suggestions help us shape future content and make this series better for everyone.

    • Celebrating 200 posts of Kaizen! Share your ideas for the milestone post

      Hello Developers, We launched the Kaizen series in 2019 to share helpful content to support your Zoho CRM development journey. Staying true to its spirit—Kaizen Series: Continuous Improvement for Developer Experience—we've shared everything from FAQs

    • Kaizen #193: Creating different fields in Zoho CRM through API

      🎊 Nearing 200th Kaizen Post – We want to hear from you! Do you have any questions, suggestions, or topics you would like us to cover in future posts? Your insights and suggestions help us shape future content and make this series better for everyone.

    • Client Script | Update - Introducing Commands in Client Script!

      Have you ever wished you could trigger Client Script from contexts other than just the supported pages and events? Have you ever wanted to leverage the advantage of Client Script at your finger tip? Discover the power of Client Script - Commands! Commands

    • Recent Topics

    • Text snippet

      There is a nice feature in Zoho Desk called Text Snippet. It allows you to insert a bit of text anywhere in a reply that you are typing. That would be nice to have that option in Zoho CRM as well when we compose an email. Moderation Update: We agree that

    • Kaizen #206 - Answering your Questions | Displaying Related Purchase Orders from Zoho Books in CRM Deals using Queries

      Hello everyone! We're back with another post in the Kaizen series. We're grateful for the feedback we received from all of you! One of the questions we received was "I would like to see the list of Purchase Orders in Zoho Books for a Deal in CRM." We

    • Add Analytics function for Title case (capitalising each word in a string)

      At present, you can only capitalise each word in a string in Analytics during data import. It would be really useful to be able to do this with a formula column, but there is no Title Case function.

    • How to conditionally embed an own internal widget with parameters in an html snippet?

      Hello everyone, I'm trying to create a dynamic view in a page using an HTML snippet. The goal is to display different content based on a URL parameter (input.step). I have successfully managed to conditionally display different forms using the following

    • Where can I find rejected inbound mails and their reason for rejection

      Hi, I was recently made aware by a mailing list which I am subscribed to (ffmpeg-devel@ffmpeg.org) that my Zoho mail Mail account is rejecting some emails. If I look under Admin Panel > Security & Compliance > Quarantine > Incoming, the list there is

    • Sync more than one Workdrive

      Hello Please I'm facing some difficulties since some days. In my company we have many zoho accounts in different organisations. And I have to find a way to sync all these Workdrives. I spend many hours to search it on zoho Workdrive but no solution. Could someone help me ? Any idea how I can achieve it ? Thanks in advance. Regards

    • Zoho writer unable to merge documents to PDF with basic fonts in Hebrew or fonts from my computer

      I created several forms that will be merged into PDF files through Zoho Writer and I am unable to receive the PDF in the basic fonts of the Hebrew language or in the fonts I have on my computer. The writer exports to PDF an exchange font that looks very

    • Base Currency Adjustment Reversal

      Two questions surrounding the base currency adjustments (BCA). I recently ported over from QB so I need to enter the base currency adjustments. In QB, it will calculate the BCA for you at the end of the year and then reverse it at the top of the following year. Makes sense. Does Zohobooks not do this as well? I created a BCA for Dec 31, 2016 but no reversing entry was made Jan 1, 2017. Am I supposed to manually do a reversal? I'm not even allowed to post journals directly to the 'exchange gain loss'

    • Please implement UAE Central Bank FX rates

      Hello, as I understand from your knowledge base, any UAE business account created from September 15, 2018 does not have foreign exchange rates fetched automatically. This is a serious inconvenience and I am not sure why ZOHO has not looked into the ways

    • Search Records returning different values than actually present

      Hey! I have this following line in my deluge script: accountSearch = zoho.crm.searchRecords("Accounts","(RS_Enroll_ID:equals:" + rsid + ")",1,200,{"cvid":864868001088693817}); info "Account search size: " + accountSearch.size(); listOfAccounts = zoho.crm.searchRecords("Accounts","(RS_Enroll_ID:equals:"

    • Making digital signatures accessible to all: Introducing accessibility controls in Zoho Sign

      Hi there! At Zoho Sign, we are committed to building an inclusive digital experience for all our users. As part of our ongoing efforts to align with Web Content Accessibility Guidelines (WCAG), we’re updating the application with support that will go

    • Super Admin Access to All Courses and Spaces in Zoho Learn

      Dear Zoho Learn Team, We hope this message finds you well. We are using Zoho Learn extensively for internal and agent training. While managing our courses and spaces, we encountered a significant limitation regarding admin access and course management.

    • Print checks for owner's draw

      Hi.  Can I use Zoho check printing for draws to Owner's Equity?  This may be a specific case of the missing Pay expenses via Check feature.  If it's not available, are there plans to add this feature?

    • [New Release 2024] Create and embed custom capabilities across CRM with Kiosk Studio, our latest no-code tool

      [Update | New series] We've started publishing a series of posts on Kiosk Studio. It's called Kiosk Studio Sessions and you can check out the first one here! [Update | 15 Oct} Session #2 is live! This one will look at how to create a kiosk for your call

    • Revenue Management: #10 Common Mistakes while Recognizing Revenue

      We are at the end of the series on Revenue Management, covering how different businesses recognise revenue. Even with clear standards like ASC 606 and IFRS 15 in practice, businesses often struggle with the nuances of revenue recognition. Especially growing

    • Windows Desktop App - request to add minimization/startup options

      Support Team, Can you submit the following request to your development team? Here is what would be optimal in my opinion from UX perspective: 1) In the "Application Menu", add a menu item to Exit the app, as well as an alt-key shortcut for these menus

    • integarting attachments from crm to creator

      when i tried to integrate pdf attachments from crm to creator via deluge i am getting this error {"code":2945,"description":"UPLOAD_RULE_NOT_CONFIGURED"} the code i used is attachments = zoho.crm.getRelatedRecords("Attachments","Sales_Orders",203489100020279XXX8);

    • Search Option

      🚫 Current Limitation: As of now (September 2025), Zoho FSM lacks a global search functionality, which makes it difficult to quickly: Find specific Work Orders by number or keyword Search for customer records or contact info Locate assets, jobs, or service

    • Mobile Chat Window - Full Screen

      Hello, The mobile chat window takes up the full screen, which is highly confusing for most customers! Using a desktop machine, I see the same happens when reducing the browser width to 800px or below. This suggests that it responsive web design, causing the switch to full screen. Can we fix this very annoying behaviour ourselves using a custom css file? If so, can you please let me know how? Thanks

    • Is it possible to customize ZC Themes?

      I understand you can choose a layout and customize Brand Color, App Header, Menu, and Sub-Menu components, but can you override some of the default theme settings with CSS or a config file? For example, - Table highlight color - Listview auto filter highlight

    • Is it possible to create Custom function-based Lookup field in Zoho CRM

      Is it possible to create a custom function-based lookup field in Zoho CRM? If so, how? Use case: Need to fetch users from Zoho Projects into a dropdown field in Zoho CRM.

    • @mention in comments no notification

      Hi, hope someone can help. When we @mention someone in the comments in Zoho Creator, how is that user notifed as we don't get anything on email or in the app notifications. 

    • Zoho unified inbox

      The new changes have definitely improved things for switching between accounts.  But zoho still desperately needs a unified inbox.  It sucks to have to enter filters and folders for each and every inbox.  This seems like such a simple thing, i wonder why Zoho hasn't done it?

    • Add "Running Balance" column to Account Transaction Reports

      Hello, Currently Zoho Account Transaction Reports give you the opening balance, then lists the transactions, then provides the closing balance.  It would be great if you could add a column on the far right that shows the "Running Balance" on the account after each transaction.  There are many times when analyzing or tie-ing out transactions that this would be very helpful.  I currently have to frequently run a tape on my adding machine to get balance totals after a specific transaction on the list.

    • Unified customer portal login

      As I'm a Zoho One subscriber I can provide my customers with portal access to many of the Zoho apps. However, the customer must have a separate login for each app, which may be difficult for them to manage and frustrating as all they understand is that

    • WhatsApp Channels in Zoho Campaigns

      Now that Meta has opened WhatsApp Channels globally, will you add it to Zoho Campaigns? It's another top channel for marketing communications as email and SMS. Thanks.

    • error : Object code : 6500

      b3 = map(); b3.put("name", "Test Project Name"); updateprojects2 = invokeurl [ url :"https://projectsapi.zoho.eu/restapi/portal/era0130/projects/169495000000928007/" type :PUT parameters: b3 connection:"in2" ]; info b3 ; info updateprojects2; ------------

    • How to book GST paid in zoho books

      hi, i am a new user to Zoho books and not able to book GST paid in books, kindly suggest how i can book it in books. thanks, siddharth

    • I got unknown charge from Zoho

      Good day, I need help disputing a charge I don't know from, zoho. I have ZohoMail and ZeptoMail. I purchase credits for ZeptoMail, and for ZohoMail I am not subcribed.

    • How can I see content of system generated mails from zBooks?

      System generated mails for offers or invices appear in the mail tab of the designated customer. How can I view the content? It also doesn't appear in zMail sent folder.

    • Function 56: Automatically enable the option for customers to pay via bank account

      Hello everyone and welcome back to our series! One of the key features of Zoho Books is its integration with multiple payment gateways, allowing you to receive online payments for your invoices. This ensures faster payments, automates payment tracking

    • Attach Files to Your Notecards and share them on the go!

      Hey everyone! We’re excited to share a feature many of you have been asking for — you can now attach files directly to your text notecards and share with ease! 🙌 This update was built with your feedback in mind, especially for those who wanted a simple

    • Can i connect 2 instagram accounts to 1 brand?

      Can i connect 2 instagram accounts to 1 brand? Or Do i need to create 2 brands for that? also under what subscription package will this apply?

    • Workdrive on Android - Gallery Photo Backups

      Hello, Is there any way of backing up the photos on my android phone directly to a specific folder on Workdrive? Assuming i have the workdrive app installed on the phone in question. Emma

    • Integración Books para cumplir la ley Crea y Crece y Ley Antifraude (VeriFactu)

      Hola: En principio, en julio de 2025, entra en vigor la ley Crea y Crece y Ley Antifraude (VeriFactu). ¿Sabéis si Zoho va a cumplir con la ley para cumplir con la facturación electrónica conectada a Hacienda? Gracias

    • How to add a % Growth column for year-over-year comparison (2024 vs 2025)

      Hello, I am trying to build a monthly revenue comparison between 2024 and 2025 in Zoho CRM Analytics. My current setup is: Module: Deals (Affaires) Filter: Stage = Closed Won Date field: Closing Date Grouping: By Month Metrics: Sum of Amount for 2024,

    • How to searchByCriteria records that are under approval?

      I need to search for both approved and pending approval records Is that possible with this method? Or I need to a different method? var priceReqID = $Page.record_id; log(priceReqID); var records = ZDK.Apps.CRM.Price_List_Item.searchByCriteria("Price_Request:equals:"

    • How to add Simple Analytics to Zoho Pages?

      I have a website with Zoho Pages, how do I add Simple Analytics on it? They seem to have code they need to be embedded https://docs.simpleanalytics.com/script

    • End Date in Zoho Bookings

      When I give my appointments a 30 minutes time I would expect the software not to even show the End Time.  But it actually makes the user pick an End Time.  Did I just miss a setting?  

    • Cant seem to delete an email account

      Hello, I have researching for 4 days how to delete an email account and I am absolutely without a clue. The email account I am trying to delete is support<AT>fyshoes<dot>com. It's the first email account I made and it (is???) was associated with the super user (me). I have since changed it to adming<AT>fychoes<dot>com and I see the support email in my list but I just cant seem to get rid of it. Ultimately I want to associate that email account with another user that I want to add. This is really

    • Next Page