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

    • Zia Sentiment and Functionality on Mobile

      Please add Zia sentiment and generative responses to the mobile app. It would be nice to see the ticket sentiment and generate a response back to a user using Zia on my iPhone

    • View Account Attachments on iOS

      Please allow us to view account attachments on the mobile iOS app!

    • How do I run a PnL by Sales Person?

      I am trying to run a PnL by sales person but am not seeing the option do so. All I need to know (per salesperson) is revenue, cost of goods, gross profit.

    • View Contracts and Support Plans on Mobile

      We would like to be able to see contracts and support plans from the mobile app on iOS!

    • App like Miro

      Hi all, is there a way to have a interactive whiteboard like in Miro? We want to visualize our processes and workflows in an easy way.

    • Loan repayment Entry

      While receiving loan, i does following steps in My Zoho books. 1. Create "Loan & Advance " Account as Parent Account under Long Term Liabilities. 2. Create another account For Example "Mr. ABC's Loan as Child account under the parent account. Now: In

    • Quotes module send email reverted back into 2022??

      Our Zoho CRM PLUS quotes, sales orders, invoice modules is showing us an email composer from 2022. We cannot send emails and its been a real pain. I tried clicking the new version over there but it doesnt seem to do anything. Any help is welcome. th

    • Workflow Condition - how do check that a date / time value is in the past?

      Hello, I'm got a workflow that runs a function when records reach their 'Effective Date / Time', but sometimes records are created after the 'Effective Date / Time' so I have another workflow that checks for records which needs to be processed immediately.

    • Pre filling SignForm field values by URL field alias's in Zoho Sign

      Hi, Does anyone know if it's possible to pre fill the field values of the SignForm by using field alias's like you can in Zoho forms? To be more specific, I want to be able to change the SignForm URL to include some information like this: Before : https://sign.zoho.eu/signform?form_link=234b4d535f495623920c288fc8538cb9e6db03bbfd44499b63f3e5c48daf78f44bc47f333e2f5072cc1ee74b7332fe18b25c93fab10cb6243278d49c67eacbf30bbe5b6e1cc8c6b2#/

    • How to Split Payout in Zoho Books (Without Using Journal?)

      Hi, I'm trying to properly record payouts in Zoho Books. The issue is that each payout is a combination of sales and expenses (fees). When I try to categorise the payout transaction from the Banking tab, I can only split the transaction using income-type

    • Payment Schedule

      Please add the ability to create a payment schedule. The other options, like retainer invoices or two invoices, do not work for the customer.  We invoice a client and need to be able to show them everything they owe in one invoice, and when each payment

    • Which pricing system do you think would work best for us?

      Imagine we’re selling strictly wholesale. We’d rather not publish unit prices; instead, we quote customers case-by-case. To spur larger orders, we’re considering a transparent discount ladder—say: $0 – $999: 0 % $1,000 – $1,999: 5 % $2,000 – $4,999: 10

    • Pushing to Shipstation from Zoho

      I know there are four triggers in Flow for integration with Shiptation when something happens in Shipstation. What options do I have, if any, for pushing data TO Shipstation from Zoho?

    • Integration with ShipStation

       Any plans to integrate flow with Ship station? My scenario: When a sales order is fully picked order details get pushed to Ship station so shipping label can be created.  Ideally then tracking number would be pushed back to order.  Thanks

    • Can't Remove Payment Gateway

      I am getting the error "Settings cannot be cleared as some of the transactions are still in progress." when trying to remove the PayGate payment gateway which I was unable to get working. I am now using paystack and I want to remove Paygate.

    • Sync specific Zoho Inventory Warehouses to Zoho Commerce

      As said in the title, we would want to only sync stock from one warehouse of Zoho Inventory to the Zoho Commerce item stock. We have a 2 warehouses in different countries and the way that Zoho Commerce works (It takes stock from ALL WAREHOUSES EVERYWHERE

    • Weekly Tips : Automatically clean clutter with Junk cleanup interval

      If you regularly receive many unwanted or spam emails, your Spam folder can quickly fill up and start taking up valuable storage space in your Zoho Mail account. Instead of manually clearing it every few days, you might find it helpful to enable automatic

    • Any solution for getting portal users list in deluge or in widget

      Hi Team, Has anyone able to find the solution to get portal users list in deluge or in zoho creator widgets? Thanks, Payal

    • The Grid is here!

      Hey Zoho Forms Community! 👋 We’re thrilled to announce the launch of a feature that’s been on your wishlist for a while: Grids What is Grids? Grids let you place form fields side by side in multiple columns to create a more concise and organized form

    • GraphQL in new Send Webhooks feature

      Hello, is it possible to use GraphQL apis in the new Send Webhooks feature?

    • # 2 Why do we need a billing system when accounting covers billing?

      In today's evolving financial tech stack, businesses use a mix of tools to manage their day-to-day operations, from invoicing to full-fledged accounting. While accounting platforms typically come with built-in invoicing features, specialized billing systems

    • How to insert an Excel/Zoho Sheet table in a chat?

      Hello, is there a way to paste an excel/zoho sheet table to a conversation without loosing table lines. I tried to paste a piece of a table and all the columns and rows were gone. How to easily paste a table without a need of sending a file? Katarzy

    • Mass Update Application Status

      How to update application statuses of Multiple Applications at once? Is that possible? If not then why please consider adding it It can save hours of manual work Thats the only Option I see

    • Free webinar: Streamlining customer service paperwork with the Zoho Sign extension for Zoho Desk

      Hi there! Wondering how to bridge the gap between digitized customer service and business paperwork? Attend our free webinar to learn how you can do this by connecting Zoho Sign, our digital signature app, with Zoho Desk, our online customer service help

    • Mail Search Not Working

      Hello, Mail search is not working at all. I've tried Chrome and Mozilla. I can try and search for an exact term, or even an email that is 1st in my email list. All search does is sit and spin, or it comes up with no results. I've also tried it on my android

    • Cannot Send Email to a Gmail Account

      Hello, I have a zoho-hosted email account, alex@chirochannelnetwork.com that has trouble sending to gmail accounts.  But not all gmail accounts, only some of them. I've tried to figure this out with clients, and they don't appear to be going into their

    • Unblock ME

      info@pentekykloi.gr Unable to send message;Reason:554 5.1.8 Email Outgoing Blocked. Learn more. I purchase additional storage

    • Cannot Print Landscape with Zoho Sheet

      I am noticing that when using the Zoho Sheet desktop for Mac, that even when selecting landscape as the print option, once you choose "Print", a second system dialog opens that automatically makes the view portrait again, and does not allow printing in

    • Power of Automation : Enhancing custom date field calculations by excluding Weekends and Holidays

      Hello Everyone, A Custom function is a user-written set of code to achieve a specific requirement. Set the required conditions needed as when to trigger using the Workflow rules (be it Tasks / Project) and associate the custom function to it. Requirement:

    • portal.assignUserInProfile - Não esta adicionando

      Estou encontrando problema com este comando portal.assignUserInProfile Não esta incluindo o usuário no portal Alguém pode me dizer o que pode ser thisapp.portal.assignUserInProfile("teste@gmail.com","Customer");

    • CRM emails vs Campaigns

      Please help me understand this. I am having a difficult understanding of "Campaigns" sent through CRM (real emails) or Zoho One (blast "potentially junk" emails) This is what I currently think emails sent via CRM are "real" emails sent through linked real personal email accounts and therefore are more likely to get delivered.  We use this for critical updates for our "Approved " accounts and certain other preferred statuses emails via Campaigns are sent through the Zoho server (like MailChimp, Campaign

    • Reverse proxy

      We have a web application in the creator platform. When I launch a particular DNS, I would like that DNS to redirect to the web page of the application in creator app. Has anyone achieved it and if yes, please share how to do it.

    • Still client need to download .exe?

      Hello, the client for use zoho assist need everytime download .exe file and launch it?

    • Splitting a ticket's entire thread

      Hi, When you split a ticket it only splits the individual reply that you clicked "Split as new ticket" on. Is it not possible to split the entire ticket thread from that point into the new ticket (every reply from the split point forward)? Or is there

    • Editing the text on the Help Center home page

      Is it possible to edit the "Welcome to Help Center" message anywhere? This one: We'd like to be able to tailor it a little more ourselves.

    • WHMCS for Zoho Flow

      Can we use WHMCS for Zoho flow?

    • Online meetings through Calendar Booking form with options

      This is great to see and particularly for those users who don't have Zoho BOOKINGS. The shame of it all though is that it could have been better. Why do we have to set up separate booking forms for each type of meeting and for each online conferencing

    • Agents permission per department

      Hi Team, can I setup permission for each agent what they can do in each department, for example I want account department agents to only have view access to support department tickets and not allowed to assign or reply to clients. I am sure this would

    • CRM notes

      I want to be able to add notes to a task that do not necessarily get rolled up into an account or contact.   For example, I tasks to work on a Court Order for John Doe divorce account.  There might be lots of updates (in the form of notes) that employees

    • Alternative / optional Position

      How do you create an alternative position or an optional position (article) in offers?

    • Next Page