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

    • Add RECURRING option when adding email to calendar events

      When you add an email to a calendar event, there is no option to make that new calendar event into a recurring event.  It is counterproductive to make an event from your email to then have to go to your calendar, find the event, and make it recurring. 

    • Using Contains as a filter

      We are using Zoho Reports, ServiceDesk Plus analytics. I do not see how to create a report filter using Contains comparison of a string values, is one string contained in another. For example, Task Title contains the word Monitor. Is this possible in Zoho Reports?  This reporting feature is available in SDP reporting. Thanks in advance, Craig Rice

    • Update Subform in specific field(Status) without affecting other fields in Zoho CRM using Deluge?

      Scenario: PRODUCT Module(change name Plot) in any product status change From Available to Booked then on PROJECT Custom Module have Subform So, Subform name is Property Details now in that Subform 1 field is STATUS that update according to  product status

    • CRM verify details pop-up

      Was there a UI change recently that involves the Verify Details pop-up when changing the Stage of a Deal to certain things? I can't for the life of me find a workflow or function, blueprint, validation rule, layout rule ect that would randomly make it

    • Applications built with Zoho Creator

      Hi, I’m really interested in seeing how others have built their application using Zoho Creator, especially those designed for external users (clients, vendors, or the public). If you’ve developed something along those lines and don’t mind sharing, I’d

    • LINE Auto Message Connect to Zoho

      When I integrated LINE into the CRM, I was prompted to disable “Chat,” “Auto Response,” and “Greeting Messages,” and to enable the webhook. However, since I have already set up some auto-reply features in LINE, including Rich Messages and greeting automation,

    • Option to block bookings from specific email address or ip adresss in zoho booking

      Sometime few of our client keep booking irrelevant booking service just to resolve their queries and they keep booking it again and again whenever they have queries. Currently its disturbing our current communication process and hierarchy which we have

    • Start Form on a different page (i.e., hide form pages)?

      I have a Zoho form that uses the `Field Alias - Prefill URL` feature. My goal is to have a pre-filled field that directs the user to a specific starting page in the form. For example: The URL will have a field alias that will auto-populate a field with

    • Threaded conversations for emails sent via automation

      Hi Guys, I hope you are doing well. Don't you guys think we should have an option in a workflow to notify users either as a new email or the previous email thread. For example, if you have one deal in the process and there are 10 different stages during

    • All new Address Field in Zoho CRM: maintain structured and accurate address inputs

      The address field will be available exclusively for IN DC users. We'll keep you updated on the DC-specific rollout soon. It's currently available for all new sign-ups and for existing Zoho CRM orgs which are in the Professional edition. Managing addresses

    • Create folder is fetch fails

      coming from zapier... zapier has a google drive task that searches for a specific folder in google drive, and if it fails to find the folder it will create a folder based on the search criteria, and contine along the singluar path of the flow. Trying

    • Meetups de Usuarios de Zoho - Noviembre 2025

      ¡Hola, Comunidad! Durante el mes de noviembre celebraremos los Meetups de usuarios de Zoho, encuentros presenciales pensados para quienes queráis mejorar vuestras estrategias de lead nurturing y aprender a sacar el máximo partido a herramientas como Zoho

    • Super Admin Logging in as another User

      How can a Super Admin login as another user. For example, I have a sales rep that is having issues with their Accounts and I want to view their Zoho Account with out having to do a GTM and sharing screens. Moderation Update (8th Aug 2025): We are working

    • Microsoft Teams now available as an online meeting provider

      Hello everyone, We're pleased to announce that Zoho CRM now supports Microsoft Teams as an online meeting provider—alongside the other providers already available. Admins can enable Microsoft Teams directly from the Preferences tab under the Meetings

    • Introducing 7 New Connectors in Zoho DataPrep!

      We’ve just made data management even easier - Zoho DataPrep now supports 7 new external connectors to help you build more robust, scalable ETL pipelines. Why it matters: ✅ Broader data access ✅ More automation, less manual work ✅ Smarter pipelines, better

    • Unify All Zoho Video Meeting Experiences into One Standardized Platform

      Hi Zoho Team, We would like to share an important user experience concern regarding the current state of video meeting functionality across the Zoho ecosystem. The Problem Within Zoho, there are multiple ways to initiate or schedule a video meeting: Zoho

    • System flaws and lack of response from Zoho

      I have had to go on here as no-one is replying to my emails regarding my problem (been 10 days and no email reply) and your chat facility online through your Zoho Books software opens and closes immediately, so not functioning properly. I actually called

    • How do I increase the email attachment size in Zoho CRM ?

      It looks like I'm limited to 10MB when sending an attachment using the email widget on a record in Zoho CRM. Is there a way to increase the size? Or can I use some other tool? From what I'm reading online, I'm maxed out at 10MB. Any insight would be greatly

    • Sales Order, Invoice and Payment numbers

      Hi zoho friends, it is me again, the slow learner. I'm wondering if there is a way to have it so the Sales order, invoice and payment numbers are all the same? It would be easier for me if they were the same number so there is not so many reference numbers

    • Missing information data Zoho inventory

      there some missing data in Zoho inventory connection. pick list stock counts bin location we have requested it via mail and the support team doesn’t gove feedback. has anyone achieve to get these info or to ask other ya les

    • First day of trying FSM in the field.

      What we found. 1. with out a network connection we were unable to start a service call? 2. if you go to an appointment and then want to add an asset it does not seem possible. 3. disappointed not to be able to actually take a payment from within the app

    • Zoho Desk app update: AI powered features

      Hello everyone! We’ve introduced various AI-powered services on the Zoho Desk app. Let's take a look at what's new. Generate Content: Generate Content uses AI to formulate responses based on the your query and provides a ready-to-use reply which can be

    • Maximum tags possible in Contacts Records

      I read in some documentation that Zoho allows a total of 200 tags across all records. Is this correct? So is it not possible to have one tag per record for 500 records?

    • How to Automate Email Sequence

      I'm having trouble trying to set up a workflow to automate an email sequence. Once a group of emails in a Task has been tagged by a certain tag, I want an instant email template to be sent. After 7 days with no response, another email template would be

    • Turning off the new UI

      Tried the new 'enhanced' UI and actively dislike it. Anyone know how to revert back?

    • Zoho Sprints Android v2.0.4 app update: Item reminders, archive Epics, Kanban projects, Epic progress

      Hello everyone! In the latest version(v2.0.4) of the Zoho Sprints Android app update, we have introduced various new features. Let's take a look at what's new! Item Reminder Stay organized and never miss an important date with the all-new Item Reminder

    • Integrate your Outlook/ Office 365 inbox with Zoho CRM via Graph API

      Hello folks, In addition to the existing IMAP and POP options, you can now integrate your Outlook/Office 365 inbox with Zoho CRM via Graph API. Why did we add this option? Microsoft Graph API offers a single endpoint to access data from across Microsoft’s

    • Credit Management: #3 Setting Credit Limit for Customers

      Think about that one familiar customer of yours who always buys on credit. They usually pay on time, maybe a little late here and there, but not alarming. So, you are fine saying, "Sure, pay later." Then, one day, they place a significantly bigger order

    • Canvas View in Zoho Recruit

      Is it possible or would it be possible to have the new 'Canvas View' in Zoho Recruit?

    • Adding Reports to Portals

      Is there a way to add Reports to portals so only the user can see report templates relevant to them?

    • How to go to the next open ticket in the queue when agents closes ticket

      Zoho Desk When agent closes a ticket - eg when they choose 'Send and Close" - where is the setting that automatically redirects them to the next open ticket in the queue?

    • Update on the client portal URL for Guest users

      We’re updating the way Guest users access their Connect network. As part of this change, all client organization portals used by Guest users will now be accessible through a dedicated domain specific to each data center. The access URLs mentioned here

    • Preserve Ticket Issue Mapping When Migrating from Jira to Zoho Projects

      Hello Zoho Projects Team, We hope you are doing well. We are currently exploring a full migration from Jira to Zoho Projects, and we identified a critical limitation during the migration process involving Zoho Desk integration. Current Situation: We use

    • Enhancements to Zoho Maps integration tasks

      Hello everyone, We're excited to announce enhancements to the Zoho Maps integration tasks in Deluge, which will boost its performance. This post will walk you through the upcoming changes, explain why we're making them, and detail the steps you need to

    • Unable to see Zoho contacts in Zoho app on ios

      Hi Support Team, I am a new user, I have created my account and installed zohomail app on iOS 16 which works. I was also able to import my Gmail contacts into Zoho Contacts, which I can see. The problem is that I can’t see these imported cobalts in Zohomail

    • Task Due Date greater than 10 years.

      We use recurring tasks in Projects where every week, month, year etc Some of our projects are greater than 10 years and we are unable to set a new due date because the difference between start date and due date is greater than 10 years. As an example

    • External User onboarding for zoho connect is not really intuitive.

      So the external user is sent an invite, which has a button that directs them to login to zoho to view the invite, but if they don't have a zoho account, they cannot access that invite, which seems kinda silly, as there is not real way on for them to create

    • Enhance Sign CRM integration

      Hello all, I'm working on a custom Deluge script to enhance the integration between Zoho CRM and Sign by using a writer merge template for additional flexibility. I want to replicate the post-sign document integration that exists between CRM and Sign

    • Hosting external websites on Zoho?

      How can I host my external website on zoho? Do we have that option? I am currently with hostinger and am looking to switch to zoho. Kindly help. Thanks.

    • How can we disable "My Requests"?

      We are not using this functionality in our system at all and our users get confused.

    • Next Page