Kaizen #199: FAQs on Multi-Select Lookup (MxN) Field in Zoho CRM

Kaizen #199: 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 #226: Using ZRC in Client Script

      Hello everyone! Welcome to another week of Kaizen. In today's post, lets see what is ZRC (Zoho Request Client) and how we can use ZRC methods in Client Script to get inputs from a Salesperson and update the Lead status with a single button click. In this

    • Kaizen #222 - Client Script Support for Notes Related List

      Hello everyone! Welcome to another week of Kaizen. The final Kaizen post of the year 2025 is here! With the new Client Script support for the Notes Related List, you can validate, enrich, and manage notes across modules. In this post, we’ll explore how

    • Kaizen #217 - Actions APIs : Tasks

      Welcome to another week of Kaizen! In last week's post we discussed Email Notifications APIs which act as the link between your Workflow automations and you. We have discussed how Zylker Cloud Services uses Email Notifications API in their custom dashboard.

    • Kaizen #216 - Actions APIs : Email Notifications

      Welcome to another week of Kaizen! For the last three weeks, we have been discussing Zylker's workflows. We successfully updated a dormant workflow, built a new one from the ground up and more. But our work is not finished—these automated processes are

    • Kaizen #152 - Client Script Support for the new Canvas Record Forms

      Hello everyone! Have you ever wanted to trigger actions on click of a canvas button, icon, or text mandatory forms in Create/Edit and Clone Pages? Have you ever wanted to control how elements behave on the new Canvas Record Forms? This can be achieved

    • Recent Topics

    • Can you inject JS in an HML+CSS+Deluge Page?

      I have an HTML + CSS + Deluge page and need just a little vanilla JS functionality. However, it seems like Zoho Creator does not allow that. I'm required to create a JS widget. Is this correct? If so: 1. Won't this quickly consume my API limit if there

    • 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?

    • Best Practice for Penny Rounding & FX Adjustments in Zoho Books

      Hi everyone, I’m just looking for some clarity on the correct way to handle very small rounding differences in Zoho Books when dealing with foreign-currency payments. What I’m currently doing: • I enter the supplier bill exactly as shown. • When paying

    • Is there a problem with sharing workdrive files with links since last night?

      As per title, we can't access folders/files through share links since last night. I created ticket but we need quick solution and didn't hear back from the support yet. The files are still accessible by the main account but all zoho files that we are

    • Enable Screen Recording in Zoho WorkDrive Mobile Apps (Android & iOS)

      Hi Zoho WorkDrive Team, How are you? We are enthusiastic Zoho One users and rely heavily on Zoho WorkDrive for internal collaboration and content sharing. The screen-recording feature in the WorkDrive web app (similar to Loom) is extremely useful- however,

    • Production Management Tool (MRP / BOM)

      Hi Guys, is there any recommended App available that works with zoho and covers the needed applications for a production? What we need is a system that covers the BOM (bill of materials), MRP (material ressources planning), MRP II (manufacturing ressources

    • Bug in Zoho Cliq Signup Flow – "%s" Placeholder Visible Instead of Product Name

      Hi Zoho Team, I would like to report a UI bug in the Zoho Cliq signup/enable flow. During the step where Cliq asks to enable the product for the company, the following text appears: Great! Your company is already available in Zoho, so you just have to

    • Exporting tickets

      I went to Setup -> Organization -> Import/Export in order to export tickets but found 2 issues: 1. The email body never gets exported. 2. There are some large numbers (like 5.57E+16) under certain columns of the exported CSV file. I could not find any export options. Please can you help with this?

    • Copy field information to clipboard

      I need to be able to transfer some field information in to the clipboard, so that I can then paste it in to our helpdesk system. Is there a way I could add a button to a detail report that does this?

    • Issuing reconciling a bank statement

      HELP! I'm trying to reconcile a bank statement. The prior month reconciled perfectly. Beginning balance is correct yet I'm off by the same amount each time. Both myself and my office manager, separately and together, have tried to complete this reconciliation

    • Detect and ignore bots in visitors

      The SalesIQ visitor numbers are basically useless to us because there is no bot detection. We get the same bots coming in from the same countries looking at the same pages every day. It can't be that difficult to tell the difference between an actual

    • Add Real-Time Microphone Audio-Level Indicator During Screen Recording

      Hi Zoho WorkDrive Team, Hope you are doing well. We would like to request an important enhancement to the Zoho WorkDrive screen-recording experience. Current Limitation: During a recording session, there is no visual indication that the microphone is

    • Zero Personalization of the File Sharing Experience

      By now (2025) this is the maximum level of personalization available for a Zoho sharing link. We gently asked Zoho if we could modify at least the background, and they replied that it cannot be customized. We're truly disappointed – and surprised every

    • Request for Solution to Reverse $500,000+ FY2024 Inventory/COGS Discrepancy in Zoho

      Dear Zoho Support Team, I hope you are doing well. We are contacting you regarding a significant discrepancy in our financial data within Zoho Books/Inventory, and we urgently need your guidance on how to correct and reverse these issues. After reviewing

    • Two factor authentication for helpdesk users

      The company i work for wants use the helpdesk site in Zoho desk, as a place for their distribution partners to ask question and look for information about our product. The things there is suppose to go up there is somewhat confidential between my company

    • Kiosk can't merge picklist or multiselect

      There is no ability to load a multiselect or picklikst field into a kiosk with the values that have been previously selected. So, I essentially have 3 unacceptable options: 1.)Load the value into a text string and include instructions like this: "Picklist

    • AGE field from DATE OF BIRTH Field.

      HI! I have a field called date of birth in my CRM (LEADS, CONTACT etc…)     How can I know the AGE today   I would like to create a field AGE. I now how to create a field but I don´t which calculation (CUSTOM FUCTION) to make ¿ANY HELP?

    • How to update/remove file in zoho creator widgets using javascript API

      Hi Team, I have developed a widget which allows inserting and updating records I have file upload field with multiple file upload. Now while doing insert form record, I am using uploadFile API to upload files for that record. I am using updateRecord API

    • Announcing new features in Trident for Windows (v.1.34.4.0)

      Hello Community! Trident for Windows just got better! With this update we have features that make your daily work easier and more efficient. We've added some features that are exclusive to our app and we're sure you'll find them useful. Let’s dive into

    • Report Hover Setting

      Would be great if we will able to show information to the user while hovering a record in a report.

    • Vertical images displayed as horizontal

      Some pictures that originally are in vertical position are displayed in horizontal after the upload. It seems that system rotates them by 90 degrees. How can I fix this issue?

    • Plug Samples #12: Verify Customer Mobile Numbers with OTP to Avoid Spam Entries

      Hi Everyone! Verifying customer information is critical in business to filter out junk data and spammers. Whether it’s lead generation, appointment booking, or any other operation, ensuring quality data is essential for driving meaningful outcomes. A

    • Zoho Desk iOS app update: Saved filters and sort options

      Hello everyone! Saved filters created on the web(desk.zoho.com) for tickets are now accessible on the Zoho Desk iOS app. You can easily rename, delete, or clear filters on the go. We have also introduced Sort options on the ticket listing screen, allowing

    • Big Things Just Dropped in the SalesIQ Universe: Top Upgrades You’ll Love in Nova’25

      Nova'25 has landed, and it’s packed with meaningful upgrades to help you engage smarter, work faster, and scale with ease. Whether you're into proactive messaging, smarter automation, or better admin control, there's something here for everyone. Here's

    • Time Entries in Analytics

      I am trying to import a zoho sheet into zoho analytics. In my sheets one of the columns has "time Entries" in this "format HH:MM am/pm" example 11:00 PM. After import, i noticed that analytics converted the time to "00 Jan 1900 23:00:00".. how do i maintain

    • Amazon invoice in Zoho Books

      I have just made my first few sales on Amazon India. Amazon Seller account generates invoices for the sales made on Amazon. These invoices are sent to customers also. Now when I was only making offline sales, I used to create Invoices in Zoho Book. Now

    • Zoho Creator Upcoming Updates - November 2025

      Hello everyone, Welcome to your monthly roundup of new features and enhancements! We hope you've already taken a look at Release Projection 2—it details the features coming your way for the rest of the year. And this month, we're excited to start rolling

    • Zoho Webinar + HubSpot : Simplifiez la gestion de vos données de webinaires

      Les webinaires sont aujourd’hui essentiels pour interagir avec vos prospects et vos clients. Cependant, la gestion des données entre plusieurs plateformes peut vite devenir complexe. Grâce à la nouvelle intégration entre Zoho Webinar et HubSpot, vos outils

    • I am trying to give access to one of our educators access to 3 forms in Zoho and she is not able to view the data - Access issue

      Hi Team, When I try to provide read access to one of our educators on Zoho for Pre-training , post training and Impact survey forms submit form access which also allows them to read , it does not show them data

    • 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

    • PUNJAB NATIONAL BANK (CORPORATE) INDIA - NOT AVAILABLE IN BANKING

      Dear sir, Kindly fix it. PUNJAB NATIONAL BANK (INDIA) is available but PUNJAB NATIONAL BANK (CORPORATE) is not available. Kindly enable this banking since we need to categorize the entries. Regards, Sanjay Jena email id/ user id : travewithmerchant@

    • Is it possible to create a word cloud chart in ZoHo Analystics?

      Hi there, I have a volume of transaction text that I would like to analyse using word cloud (or other approcah to detect and present word frequency in a dataset). For example, I have 50,000 records describing menu items in restaurants. I want to be able

    • Unable to Delete Items – No Visible Transactions but Error “Items which are a part of other transactions cannot be deleted…”

      Hello Community, We are using Zoho Inventory for our business and encountered a persistent issue that is preventing us from deleting certain items. The message shown is: “Items which are a part of other transactions cannot be deleted. Instead, mark them

    • Kaizen #216 - Actions APIs : Email Notifications

      Welcome to another week of Kaizen! For the last three weeks, we have been discussing Zylker's workflows. We successfully updated a dormant workflow, built a new one from the ground up and more. But our work is not finished—these automated processes are

    • Facturation électronique 2026 - obligation dès le 1er septembre 2026

      Bonjour, Je me permets de réagir à divers posts publiés ici et là concernant le projet de E-Invoicing, dans le cadre de la facturation électronique prévue très prochainement. Dans le cadre du passage à la facturation électronique pour les entreprises,

    • Your bot just got smarter: AI-Powered routing that reads between the lines

      What if your bot could tell the difference? Between a visitor who just needs a quick answer, someone actively comparing options, and a frustrated customer one click away from leaving? Most bots can't. They deliver the same response to everyone, missing

    • Weekly Tips : Master Keyboard Shortcuts in Zoho Mail

      If you spend a lot of time managing emails, switching between your mouse and keyboard can slow you down. Whether you are replying to clients, organizing your inbox, or searching for messages, every second counts. So, how can you streamline your email

    • Introducing custom lookup fields in the Tickets, Contacts, and Accounts modules

      Hello all, We are excited to announce a new enhancement that will empower you to further customize the Tickets, Contacts, and Accounts modules. Now, you will be able to create custom lookup fields in your Tickets, Contacts, and Accounts layouts for more

    • DKIM cannot be enabled for the domain as no verified default selector present

      Can't get the DKIM working. May you please check my account (nksy.us) to see what's wrong?

    • Collections Management: #3 Tackling Payment Failures

      Sam refreshed the dashboard. "Payment failed". Same customer. Same subscription. This is happening for the third time. He sends a usual email: "Your renewal payment failed again. Could you please check and retry?" A couple of days passed, and there was

    • Next Page