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

      • Where to integrate Price Book and Product List Price

        Hello, We sync zoho crm all modules with all data to zoho analytics. In zoho crm, we have "Price Books" and "Products" modules, where each product is assigned to a few price books with different list prices. From zoho crm, I am able to export a dataset

      • Form / CRM Integration Not entering into workflow

        I have a simple form setup with company name, first name, last name and lead source. Each of the fields are mapped to CRM Leads module. When the form is submitted, the lead is populated properly. I also have a workflow created that when the lead source

      • Automating CRM backup storage?

        Hi there, We've recently set up automatic backups for our Zoho CRM account. We were hoping that the backup functionality would not require any manual work on our end, but it seems that we are always required to download the backups ourselves, store them,

      • Zoho Slowness - Workarounds

        Hi all, We've been having intermittent slowness and Zoho just asks for same stuff each time but never fix it. It usually just goes away on it's own after a couple weeks. Given that speed is a very important thing for companies to be able to keep up with

      • Don't understand why Forms Mobile Scan and Fill not working

        I have configure enabled mobile scan and fill, I have enabled QR and Bar code on two fields name and position, I have mapped seq 1 to Name and seq 2 to position, I have created a 2d QR code with the person names and position, seperated by a comma. When

      • Recurring Supervisor Rule Reminders for Open/In-Progress Tickets

        Hello Zoho Support Team, I would like to suggest a potential improvement regarding reminders for tickets and activities in Zoho Desk. Currently, it is possible to set reminders only once. In the Supervisor Rules section, it is possible to configure reminders

      • Template usage

        Hi, We are using some templates as a response to customer questions. Is it possible to analyze the usage of these templates? We want to know if the use of our templates has increased over time

      • Ticket Status Colors

        Can i change the colors of Ticket Status in the admin panel? Or even change the background of the entire cell of a Critical ticket? This way its easy for my agents to see a urgent ticket when it comes in. Right now everything is black text. Here Right

      • Sync Lookup Fields from Zoho CRM

        HI Team, I have synced a lookup field from my CRM data to Campaigns. When I view the synced data the field appears to display a Zoho CRM record ID rather than the text value. Is it possible to get the sync to import the text value rather than the CRM

      • New From Address cannot verify

        I have created a new From Address, which is the support@ address for my domain, that forwards to the default support mailbox. Presumably then, the verification email that is sent, should turn up as a ticket, but it does not. How can I verify my from address so that I can use my own domain?

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

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

      • issue with image thumbnails not showing in Image Selector

        We have been using Zoho Campaigns for over a year, maybe close to two years, and this issue just started happening in the last month. I wanted to wait to see if it would resolve on it's own, and it doesn't seem to be. The thumbnail images for all new

      • Deluge Script for adding tag

        Trying to create a custom function where a tag is added to a record - but for the life of me, I cannot figure out how. Help please! Moderation Update: Adding the help doc and sample to add Tags to records via deluge here for everyone's benefit. tag1 =

      • Unlock your Zoho Vault with OneAuth, Windows Hello, TouchID, YubiKey, and many more!

        Hello everyone, We are thrilled to introduce one of the most highly requested features – the ability to unlock your Zoho Vault using various authenticators. The primary purpose of a password manager is to remember just one master password and securely

      • Creator roadmap for the rest of 2022

        Hi everyone, Hope you're all good! Thanks for continuing to make this community engaging and informative. Today we'd like to share with you our plans for the near future of Creator. We always strive to strike a good balance of features and enhancements

      • How can I get base64 string from filecontent in widget

        Hi, I have a react js widget which has the signature pad. Now, I am saving the signature in signature field in zoho creator form. If I open the edit report record in widget then I want to display the Signature back in signature field. I am using readFile

      • Add Setting Values to the Rules

        Hi, It would be great to use the rules to set values in fields for submission, such as if a Type is X then set the Field Y to 10. Thanks Dan

      • So we ran with it for the week

        In our company i bit the bullet and ran with FSM for a whole week. Service calls, deliveries and surveys. Covering about 30-120 miles a day to domestic properties. Loved the appointment list and satnav integration. Loved the timer to measure the appointments.

      • Is there a way to set Document Owner/Sender via the API

        When sending requests for zoho sign, it would seem zoho uses the id of the person that created the zoho api cred to determine the owner_id, is there a way to set a default for this?

      • What's New - September 2025 | Zoho Backstage

        September has been a different month for Zoho Backstage. Instead of rolling out a long list of new features, we focused on something just as important: Performance, reliability, and stability The event season is in full swing, and organizers are running

      • Prevent stripping of custom CSS when creating an email template?

        Anyone have a workaround for this? Zoho really needs to hire new designers - templates are terrible. A custom template has been created, but every time we try to use it, it strips out all the CSS from the head.  IE, we'll define the styles right in the <head> (simple example below) and everything gets stripped (initially, it saves fine, but when you browse away and come back to the template, all the custom css is removed). <style type="text/css"> .footerContent a{display:block !important;} </style>

      • Stock Quotes/Spreadsheet

        It would be nice if we could download security and mutual fund prices from Yahoo Finance (or?) in order to maintain an up to date investment portfolio on Zoho. Any chance?

      • link to any Belgian bookkeeping software?

        Hello, Does anyone on this Forum can help me with the question whether the ZOHO CRM (Invoices) or ZOHO Book can be linked to software that is used for Belgian Bookkeeping/accountancy? By linking, I mean either with the help of a middleware program or either by the ability to export the custom made reports as CSV-files... If someone has an experience with online CRM-Accountancy in Belgium, with ZOHO (or other), it would be great to read it... Thank you

      • marketing automation

        wants to know about the zoho marketing automation

      • Problems with email templates (HTML - Outlook)

        Hi there, I've been trying to create a newsletter from the template "Business 4". Everything looks great in the preview, but when I send it to my Outlook inbox, the layout doesn't seems to stick. More particularly: - The line-height is way more reduced, even though I used the line-height tool from the template - Columns but they are sometimes misaligned - Font size is not always the one I've selected. Could you help? Thanks!

      • How to create a drop down menu in Zoho Sheets

        I am trying to find out, how do I create a drop down option in Zoho sheet. I tried Data--> Data Validation --> Criteria --> Text  --> Contains. But that is not working, is there any other way to do it.  Thanks in Advance.

      • Introducing Keyboard Shortcuts for Zoho CRM

        Dear Customers, We're happy to introduce keyboard shortcuts for Zoho CRM features! Until now, you might have been navigating to modules manually using the mouse, and at times, it could be tedious, especially when you had to search for specific modules

      • Zoho CRM's custom views are now deployable from sandboxes

        This feature is now available for users in the AU, JP, and CN DCs. This feature is now available for users in CA and SA DCs. New update: This feature is now available for users in all DCs. Hello everyone, We're excited to announce that you can now deploy

      • Zoho One - Syncing Merchants and Vendors Between Zoho Expense and Zoho Books

        Hi, I'm exploring the features of Zoho One under the trial subscription and have encountered an issue with syncing Merchant information between Zoho Expense and Zoho Books. While utilizing Zoho Expense to capture receipts, I noticed that when I submit

      • Limit in number of records for subforms and multi-select lookup fields

        It is my understanding that a maximum of 100 items can be selected in a multi-select lookup field, and that a total of 200 items can be selected in total between both subforms in a given module.  Are there any ways to work around this limitation if we

      • Kaizen #136 - Zoho CRM Widgets using ReactJS

        Hey there! Welcome back to yet another insightful post in our Kaizen series! In this post, let's explore how to use ReactJS for Zoho CRM widgets. We will utilize the sample widget from one of our previous posts - Geocoding Leads' Addresses in ZOHO CRM

      • Getting Permission denied to access this portal.

        We have one user that can't login to projects even though access has been granted. This user can login to accounts.zoho.com but when login to https://projects.zoho.com/portals.do we get this error: Unauthorized login to this portal Permission denied to access this portal. Check your portal URL again. Sometimes we also get "server too busy". We have tried killing sessions (in accounts.zoho.com) and we have deleted cookies; and tried different computers and still the same problem. All others use can

      • Does Zoho Docs have a Line Number function ?

        Hi, when collaborating with coding tasks, I need an online real time share document that shows line numbers. Does Zoho's docs offer this feature ? If yes, how can I show them ? Regards, Frank

      • Setting Default Views for Custom, List and Detail Views

        Hey, Is it possible to set a default custom view, list view and detail view for a module for every user? We are onboarding a lot of non technical people that struggle with these things. Setting the views as default would really help. Btw: also setting

      • Custom function return type

        Hi, How do I create a custom deluge function in Zoho CRM that returns a string? e.g. Setup->Workflow->Custom Functions->Configure->Write own During create or edit of the function I don't see a way to change the default 'void' to anything else. Adding

      • Filter Based API request in Zoho Books using POSTMAN

        How do I GET only specified CONTACTS based on created time or modified time in Zoho Books using POSTMAN. In the api documentation, it is written we can apply filters but I need a sample request.

      • URL validation

        We use an internal intranet site which has a short DNS name which Zoho CRM will not accept.   When attempting to update the field it says "Please enter a valid URL". The URL I am trying to set is http://intranet/pm/ Our intranet is not currently setup with a full DNS name and given the amount of links using the shortname probably isn't a feasible change for us.

      • Has anyone been experiencing slow issues?

        Dear all, I just want to ask if anyone has been experiencing slow issues with Zoho Creator in the past two weeks? I worked with the ISP to improve network quality by changing routes and upgrading bandwidth, but nothing changed. I am in Vietnam.

      • Zoho Projects Roadshows 2025 - USA

        Dear Users, After an amazing response to our roadshows in 2024, we are excited to be back for the second year in a row! Join our team of experts as they walk you through the most-used features in Zoho Projects, explore powerful automation capabilities,

      • Billing Management: #6 Usage Billing in SaaS

        Imagine a customer shuffling across multiple subscriptions, a streaming service, a music app, cloud storage, and a design tool. Each one charges a flat monthly fee, regardless of how much or how little they use. Some months, the customer barely opens

      • Next Page