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 :


      • Recent Topics

      • Different languages for users

        Hello, Do you plan to enable individual users to select their languages for interface? Currently language can be changed for everyone - it looks like a settings for a whole portal, which is not good when you are working internationally. Best regards,

      • Transaction Locking with the dynamic date

        Is it possible to dynamically update dates on transaction locking. We want to lock transaction x days from today

      • Unable to change sales_order status form "not_invoiced" to "invoiced"

        I am automating process of creating of invoice from sales_orders by consolidated sales_orders of each customer and creating a single invoice per customer every month. I am doing this in workflow schedule custom function where i create invoice by getting

      • Apply Vendor Credits Automatically

        We are bulk importing Vendor credits in Zoho Books!!! Is there a way to apply vendor credits automatically to the first UNPAID bill of the Vendor?

      • Apply Vendor Credit Automatically

        Hello!!! Is there a way where in we can apply vendor credits automatically on the FIRST OUTSTANDING BILL of the vendor?? We have lots of VENDOR CREDITS ISSUES mostly!!! Applying it manually is a pain for us. Would be great if we have a way to apply the

      • Need Easy Way to Update Item Prices in Bulk

        Hello Everyone, In Zoho Books, updating selling prices is taking too much time. Right now we have to either edit items one by one or do Excel export/import. It will be very useful if Zoho gives a simple option to: Select multiple items and update prices

      • Creator problem: Edit form View not displaying whole form

        I'm having problems with the form in my database. The edit view is not showing the whole form: This is how it looks in the normal view: As you can see, there is a whole section in the bottom right of the form which is not displaying in the Edit View. This means that I can't change or delete any of these fields... Anybody had a similar problem or know a solution? Any help would be appreciated.   Cheers,

      • Vendor Master Enhancements for Faster Purchase Entry

        I’d like to suggest a few features that will improve accuracy and speed during purchase voucher entry: Automated Item Tax Preference in Vendor Master Add an option to define item tax preference in the vendor master. Once set, this preference should automatically

      • Quick Item Search & Auto-suggestion for Invoices

        Hi Team, I am facing an issue while creating invoices in Zoho Books. Currently, I have to type the full item name in the correct sequence and spelling for it to appear. For example, my item name is: "Distemper Acri Silk Special White 10kg" If I type something

      • Function #53: Transaction Level Profitability for Invoices

        Hello everyone, and welcome back to our series! We have previously provided custom functions for calculating the profitability of a quote and a sales order. There may be instances where the invoice may differ from its corresponding quote or sales order.

      • Integrating Chatbot with Zoho Creator Application

        Is it possible to integrate a chatbot with a Zoho Creator application?

      • Average Costing / Weighted Average Costing

        Hello fellow maadirs. I understand Zoho Books uses FIFO method of dealing with inventory costing, but do you guys have any plans to introduce average costing? We indians need average costing. It's part of our culture. Please. I beg thee. Thanks.

      • 'Add Tax To Amount' not reflected in Invoice

        Hi Zoho Support, I'm experiencing an issue with tax calculation display in my invoice template. Despite having "Add tax to amount" box checked in the template settings, the Amount column is not showing the tax-inclusive total for line items. Current behaviour:

      • "Subject" or "Narration"in Customer Statement

        Dear Sir, While creating invoice, we are giving in "Subject" the purpose of invoice. For Example - "GST for the month of Aug 23", IT return FY 22-23", "Consultancy", Internal Audit for May 23". But this subject is not coming in Customer Statement. Only

      • A real WYSIWYG field instead of the limited rich text

        Hi to everyone A "real" WYSIWYG or HTML field that outputs good HTML code when accessed through the API would be excellent. I tried to use the rich text field, but the styling options are limited. For example, there are no heading tags (h1 to h6), and

      • Delete my store of Zoho commerce

        Hi Team, I want to delete my stores of commerce. Please help me asap. Looking for the positive response soon. Thanks Shubham Chauhan Mob: +91-9761872650

      • Delete Inactive Zoho Accounts - Access Cleanup_User Id: 60001640923

        As part of our Zoho access hygiene, we’ve reviewed and deactivated several inactive user accounts. These accounts have not been used in the past year and are no longer tied to active operations. All access rights have been revoked, and records retained

      • No feedback from Zoho Books regarding Yodlee feeds for Investec

        I reported on 6 Feb 2025 that the Bank Feeds for Investec bank via Yodlee are not working. To date there has been no resolution. You are charging us for a suite of products where the functionality does not work. Please advise how you will refund me for

      • Inappropriate Removal of Features

        It's the first with any software where I am experiencing that an existing customer has some of his exiting features removed. Moreover, new Zoho One users are paying less than us. Is this going to be Zoho's "normal behaviour". If so, it is going to be

      • Filtering report embeded in page

        Right now we are using a page variable to filter a report on a page. However, it being a page variable makes it reset if you go to another report/form, we want the filter to be kept the same. I tried using an application variable according to zoho you

      • Export Invoices to XML file

        Namaste! ZOHO suite of Apps is awesome and we as Partner, would like to use and implement the app´s from the Financial suite like ZOHO Invoice, but, in Portugal, we can only use certified Invoice Software and for this reason, we need to develop/customize on top of ZOHO Invoice to create an XML file with specific information and after this, go to the government and certified the software. As soon as we have for example, ZOHO CRM integrated with ZOHO Invoice up and running, our business opportunities

      • Zia summarizes your IM bot chats in real time

        Hello everyone! Let's say you’re an agent taking over a chat where a customer was booking a flight through a bot on WhatsApp. They've already shared key details, like their destination, travel date, and number of passengers. You need to understand the

      • Megamenu

        Finally! Megamenu's are now available in Zoho-Sites, after waiting for it and requesting it for years! BUT ... why am I asked to upgrade in order to use a megamenu? First: Zoho promised to always provide premium versions and options for all included Zoho-applications

      • Cancel and refund

        Hi, Yesterday I paid for the Zoho email subscription. Within a few minutes, I realized that the subscription counts one email ID as one user. To make another email ID for the same domain name, I'd have to pay for another user. I emailed right away to

      • One Contact with Multiple Accounts with Portal enabled

        I have a contact that manages different accounts, so he needs to see the invoices of all the companies he manage in Portal but I found it not possible.. any idea? I tried to set different customers with the same email contact with the portal enabled and

      • Kaizen# 209 - Answering Your Questions | All About Client Script

        Hello everyone! Welcome back to another exciting Kaizen post! Thanks for all your feedback and questions. In this post, let's see the answers to your questions related to Client Script. We took the time to discuss with our development team, carefully

      • To Do: shareable task links without login

        Hi! I’m using Zoho Mail and ToDo in my daily work, and I’ve run into one limitation that’s a real blocker for me. Right now, to share tasks with managers or directors, they need to have a Zoho account and be added to a group. In practice, many of them

      • Ability to turn off "Would you like this amount to be reflected in the Payment field?" message

        Team, Is there any way to turn off the message" Would you like this amount to be reflected in the Payment field?" when I make a payment? This is so annoying. This happens EVERY TIME I put an amount in the Payment Made field.

      • Unlock agreement intelligence with Zoho Sign's latest AI updates

        Hello! If you've been struggling with long, complex agreements and spending way too much time on them, here's exactly what you'll want to hear: Zoho Sign now integrates with OpenAI's ChatGPT to make agreement management smarter and simpler. Acting like

      • Currency abbreviations

        Hello, Im stuck, and need help. I need the currency fields for example, opportunity value, or total revenue, to be abbreviated, lets say for 1,000 - 1K, 1,000,000 - 1M, and so on, how should I do this?

      • Embed Sign Document

        Has anyone tried embedding a document in a webpage? I'm building a webpage (using PowerPage) and I'm trying to embed it using an iframe then I got this error: Refused to display 'https://sign.zoho.com/' in a frame because it set 'X-Frame-Options' to

      • Zeptomail API error 500 internal server error

        Hi Everyone, getting this eror continuously! Can anyone please guide around the same! Zeptomail API error 500 internal server error Best Regards

      • We’re transitioning from Zoho ShowTime to TrainerCentral

        Hello everyone, Zoho ShowTime was originally built as a training platform to serve training agencies, HR teams, and individual trainers. As the platform grew, we realized that more creators and businesses could benefit from its capabilities. That’s why

      • Emails Are Not Being Delivered to My Inbox

        Hello Zoho Support Team, I am experiencing an issue with my Zoho Mail account. The most important problem is that emails are not being delivered to my inbox. Details: My Zoho Mail address: info@coreforcelife.com What happens: I am not receiving any incoming

      • Radar In Focus: Track customer support metrics using Radar's static reports

        Hello everyone, Welcome back to the Radar In Focus series, where we explore how Radar features can add value to your business. In this episode, we're looking at Radar static reports. The help desk is filled with vast amounts of data that can be analyzed

      • Mail ToDo & Tasks Webhooks

        Our company uses Zoho ToDo inside Mail to manage our tasks. When I create a task and assign it to a team member it does not notify them unless I add a reminder via mail. I'm trying to create a webhook for when a task is created to send a cliq message

      • Allocating inventory to specific SO's

        Is there a way that allocate inventory to a specific sales order? For example, let's say we have 90 items in stock. Customer 1 orders 100 items. This allocates all 90 items to their order, and they have a back order for the remaining 10 items which could

      • Improved UI for a Seamless User Experience - Calls, Tasks, and Meetings

        Hello all, We are making UI unification across CRM so that the UI experience is seamless across the product. As part of that effort, we have made changes to the details page of activity-based module records—Meetings, Calls, and Tasks. Let's look at these

      • 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

      • Refund

        Hi There, Please refund me asap possible, because of no support given. Thank you

      • Next Page