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 #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.

    • 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

    • Recent Topics

    • Errors Getting a Bank Transaction

      Using Postman(for testing), I am receiving errors when attempting to get a single bank transaction. I am able to receive the list of bank transactions with https://www.zohoapis.com/books/v3/banktransactions/?organization_id={org_id} but when I try to

    • Subscriptions Plans and CRM Products Integration?

      Is there any way to set up plans and pricing in Zoho Subscriptions and have those available as Products in the CRM? We are trying to set up the CRM and the Products seem to be more geared toward selling products that are not subscription based.  So if we sell annual or monthly contracts which are $10/seat/month, I can set this up as a plan in Subscriptions, but how can I set the same thing up in the CRM for the salespeople to sell/quote? What is the best practice for setting up the CRM Products to

    • Mapping Zoho Subscription Plans and Products to CRM and Books

      We have products that are one time products and subscription products.   1) We would like to have the ability to create an opportunity in CRM that includes both one-time charge products and subscription products.  Currently the only way of creating a subscription product is by defining a "Product->Plan" hierarchy in Zoho Subscription.  It appears that the only SYNC between Subscription and CRM is around contacts and the Product->Plan hierarchy doesn't sync to CRM, thus, you would need a duplicate

    • Bulk update fields based on date

      Hi! I need all the quotes with "Quote Stage" set to "Next Year" to update to "Draft" every January 8 (every year). Can you help?

    • Target for a campaign

      Hi, Hope you can help me. I need to create a report (for a marketing campaign) that combines Deals and Contacts to export all the contacts with closed deals. I can easily do that, what I cannot do is to remove from the target the contacts that have more

    • Zoho Desk + Jira integration - Email notifications and comments posted by administrator instead of real user

      Dear All, I set up the integration under my admin account, and now when users leave comments in Jira (to created tickets in Zoho Desk), the email notifications show that the ‘Administrator’ left a comment, not a real user. The same happens in the ticket

    • Celebrating the power of visuals

      On World Photography Day, we would like to highlight the power of visuals in customer service. Visuals promote learning and understanding in less time. A photograph can rekindle a memory, convey more than words, and give a fresh perspective. How does

    • Blocking / black listing customers

      Hi, We have a situation, we observed that certain customers are blocking multiple appointments with our advsiors but not showing up. Some of these are repeat offenders. This leads to those service hours getting blocked and not available for genuine customers.

    • Feature Request: Email Templates for notifications accross all services

      Currently in Zoho Bookings, email notifications (such as booking confirmations, reminders, and cancellations) must be customized individually for each service. This becomes time-consuming and error-prone when managing multiple services that require consistent

    • Approval-based booking with Zoho Creator and Zoho Bookings

      Hi community members, We have developed a workaround for approval-based booking using Zoho Creator and Zoho Bookings! This provides a temporary solution as we work on the native feature, and it's useful for anyone needing an approval workflow when confirming

    • Member Accounts in Related List

      Hi Team, Currently, when a parent account is associated with an account in FSM, there is no related list displaying the associated member accounts under the parent account’s related list section. To view member accounts, I have to manually search using

    • how do i remove a specific Zoho Service from my account

      I no longer need Zoho CRM, ZRM Assist nor ZRM BugTracker. How do I remove them from the list of apps for my account?

    • I Want migarte all invoice details to zoho sheets

      I want to migrate all existing invoice details to Zoho Sheet, and automatically update the sheet whenever a new invoice is created.

    • were can i find my invoices i need this for my accountant

      were can i find my invoices i need this for my accountant, how can i get id direct to my email?

    • ONLY email field not populating Writer fillable document (randomly)

      I have a Zoho Writer fillable document that has pulled all my data from my Zoho Sheets file, EXCEPT the email column. It pulled every data before and after that column with no issues. Screenshots attached. It's not my first time using the app or the feature,

    • My number is marked as spam

      Hello Zoho Mail Support, My phone number was incorrectly flagged as “spam” during sign-up. This is my personal number, and I have not engaged in any spam activities. Kindly review and verify my account so I can proceed with my email setup. Thanks.

    • Personnalisation des paramètres dans Zoho Mail

      Pourquoi cela compte-t-il ? La personnalisation des paramètres dans Zoho Mail permet aux administrateurs de configurer l’environnement de messagerie en fonction des besoins spécifiques de leur organisation. Que ce soit pour alléger l’interface pour certaines

    • How To Save Data Into Zoho CRM Sandbox

      Hi Community, I want to save data into my zoho sandbox , for this I am using this api endpoint - https://www.zohoapis.com/crm/v8/Patients but I am getting this error - { "success": false, "message": "Zoho API request failed", "error": { "code": "INVALID_MODULE",

    • Question about retrieving unsubscribed contacts (outside of lists) via API

      Hello, I am currently using Zoho Marketing Automation and would like to integrate it with our company’s core system. For this purpose, I am exploring the API options available to retrieve contact information. Specifically, I would like to know if there

    • Getting “mandatory field missing: Service_Line_Items” When Creating Work Order via Zoho Flow Deluge

      Hi Team, I’m trying to create a Work Order in Zoho FSM with only a Service Line Item (no Parts). However, I keep getting this error: Work Order Response: {"code":"MANDATORY_NOT_FOUND","details":{"api_name":"Service_Line_Items"},"message":"required field

    • How to customize the colors of the Client Portal login screen and add the company logo?

      As title, how to customize the colors of the Client Portal login screen and add the company logo?

    • Daily updates/fixes and how to see what was changed?

      When I receive the notification that zoho was updated and I need to refresh it. How can I see what was changed or fixed? Sometimes they change things that effect my books and I need to know what they did. For example over this past weekend something was

    • Upcoming Change: Snowflake Username/Password Authentication Deprecation – Action Required

      Hello Users, Snowflake has officially announced that username and password-based authentication will be deprecated by November 2025. You can find the official announcement [here]. If you're using a Snowflake connection in Zoho Analytics to import data,

    • Why should I choose Zoho Inventory vs Odoo?

      Hello there! I have used Zoho in different companies I've worked in, and I have a positive perception of it. I am starting a new import business for pipes, tubes, fittings, valves, elbows, etc., which all have serial numbers, cast numbers, etc., so I

    • Product Updates in Zoho Workplace applications | July 2025

      Hello Workplace Community, Let’s take a look at the new features and enhancements that went live across all Workplace applications this July. Zoho Mail Import bookmarks from Pocket Worried about losing your Pocket bookmarks? Don't worry we have got you.

    • PLEASE FIX YOR BUGS

      PICTURES ARE BEING REJECTED DESPITE THEM FOLLOWING THE GUIDELINES ON DIMENTIONS.

    • Kaizen# 204 - Answering Your Questions | Perform Field Updates before Blueprint transition via Client Script

      Hello everyone! Welcome back to another exciting Kaizen post. One of the questions we received through your Kaizen feedback was: “How can I update fields before Blueprint transition and how to prevent a transition based on a condition using Client Script?”

    • Create online meetings for Booking Pages with Zoho Meetings and Zoom

      Greetings, We hope you're all doing well. We're excited to share some recent enhancements to Bigin's Booking Pages. As you know, Booking Pages let you create public pages to share your availability so that your customers can easily book time slots with

    • Filters in audit logs

      Greetings, I hope all of you are doing well. We're happy to announce a few recent enhancements we've made to Bigin. We'll go over each one in detail. Previously, there were no filters available to narrow down data in audit logs. Now, we've introduced

    • Enhanced help options in Bigin

      Greetings, We're excited to introduce a new enhancement to Bigin's Help section: a comprehensive Help Options panel that brings together all your support resources in a single, well-organized space. Previously, the Need Help? menu provided only a limited

    • Zoho FSM API Developer Needed

      Hi, I’m looking for a developer with experience using Zoho FSM APIs. Scope: Connect WordPress website booking form to Zoho FSM Check availability (date, time, region) Create Work Orders + Service Appointments automatically Notify both customer and scheduler

    • Revenue Management: #4 What if there are uncertainties in project or service delivery?

      Our previous post taught us how Zoho Billing makes life easy for businesses with its automated revenue recognition rule. However, certain businesses have more challenges that an automated system cannot handle, and there are certain situations where automated

    • This mobile number has been marked spam. Please contact support-as@zohocorp.com

      Bom dia, estou tentando colocar o número 11 94287-6695 e esta com erro "This mobile number has been marked spam. Please contact support-as@zohocorp.com" pode me ajudar, por favor?

    • Items Serial Tracking Issue

      We enabled Zoho Items inventory tracking then disabled it after some time now we want to enable it again When I check the missing serial number reports I see one item But I cant see any option to Add the serial numbers Where and how to add the serial

    • Zoho Payroll integration with Zoho Books - unable to match multiple bank feeds to one wage payment

      For one employee's wage, I make two partial payments. Those bank feed transactions come into Zoho Books via bank integration. I make one pay-run for the month in Zoho Payroll and that comes into Zoho Books via the Zoho integration. Zoho Books doesn't let me match multiple bank feed transactions against a single wage item. Please fix urgently. I can't complete my books because of this.

    • Add Checkbox Selection & Bulk Actions to Delivery Challans Module

      Hi Zoho Team, I’ve noticed that in the Sales Orders module, there are checkboxes beside each entry that allow users to select multiple records for bulk actions such as print, email, or delete. However, in the Delivery Challans module, this option appears

    • Can't be able to check-in in laptop

      even after giving location access still i can't be able to check-in in laptop.

    • Compensation Cess on Coal ₹400 per tonne. ?????

      The compensation cess rate varies by the type of product. And the cess is calculated based on the value of the product without GST. Coal, for example, comes with a cess of ₹400 per tonne. That means that if you sell 2 tonnes of coal that have a value

    • 7 month over zoho book purchase but still not immpliments Golive

      7 month over zoho book purchase but still not immpliments Golive one problems zoho team short out then other problems come still very poor mangments and immliments team . struggling with the templates in ZOHO Books. Especially with the placement of some

    • Parent & Member Accounts (batch updating / inheritance)

      Hello, I find the Parent Account functionality very useful for creating custom views and reports, but was wondering if I can also carry out batch editing on all members (aka children) of a Parent Account at the same time. Alternatively, can I set members to automatically inherit the values of the parent? For example: We have a chain of supermarkets that buy our products. These supermarkets are all members of a Parent Account in our CRM. We release a new product and all of the member stores wish to

    • Next Page