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

      • Blog Widget: Show recent blog posts on my homepage

        Hey there I am using the Zoho Sites Blog feature. On my homepage, on the bottom I'd like to have a featured content section where I show some of my blog posts (selected, most recent, filtered by category and so on...). It would be nice to have a blog

      • How to iterate through excel data using zoho rpa

        I wanted to iterate or loop through excel data ( datatable). How can i do that

      • Zoho Commerce

        Hi, I have zoho one and use Zoho Books. I am very interested in Zoho Commerce , especially with how all is integrated but have a question. I do not want my store to show prices for customers that are not log in. Is there a way to hide the prices if not

      • Mass (Pull back) (Close WOs) (Close APs)

        Hi develop team. Just idea because Zoho FSM is great but its too manual. we have a lot of task to do every day and the system needs to have more features to automatic our tasks. I need to close several WOs, APs and Pull Back per day. Please we need mass

      • Customising Zohidesk portal default widgets

        Hello, I'm wondering how could I customise the default widgets such as "popular topics", "popular articles" using CSS or to make the tiles at the bottom match the ones that I made in the picture attached. I have made some custom widgets and edited them

      • If there’s a batch at the end, the ‘mark as inactive’ function doesn’t work.

        when my batch has a date to batch end and I "mark as inactive" he batch does not obey the status and reactivates the batch.

      • Seamless multilingual messaging and tone control in Zia IM Composer

        Hello everyone! Managing customer conversations across multiple languages can be time-consuming. Using Zia in the Instant Messaging (IM) Composer helps you overcome this by providing tools to translate content, adjust your tone, and refine your messages

      • Advanced Deluge help needed with custom function and COQL limits

        I have a scheduled function that takes a snapshot of specific metrics and saves them to a custom module. However I'm struggling with the limits of COQL. I attach my full code, but an example of the issues I'm having is that it's erroring with a 'Limit

      • Tip of the Week - Conditional Formatting Chart

        Conditional formatting allows you to highlight your data series based on a pattern or a trend in your data. This makes it easy for you to identify when your data reaches certain values or when it deviates from the trend.  Zoho Analytics allows you to

      • Zoho Learn - AI Translate

        Hi Learn team, I had a situation today where I was providing training to a client team and I had written articles into their Zoho Learn to support their learning. I realised that one of the team members was a non-native English speaker and they were struggling

      • Payroll In Canada

        Hi, When can we expect to have payroll in Canada with books 

      • Power of Automation :: Auto-Sync Custom Date Field Between Related Tasks via Blueprint Transition

        Hello Everyone, A custom function is a software code that can be used to automate a process and this allows you to automate a notification, call a webhook, or perform logic immediately after a workflow rule is triggered. This feature helps to automate

      • Introducing auto-upgrade in Zoho LandingPage

        Hi everyone, We’re excited to share an upcoming update to help you get the most out of your landing pages — the auto-upgrade option, launching on October 22, 2025. Your landing pages are designed to bring in leads, and we want to make sure you never miss

      • Workdrive comment links stopped working.

        I have marked a PDF file with 95 comments, they have worked for a while. When i clicked on them they brought me to the correct page and showed me the outline that i had drew on the plans. The comments included the page number of the outline, but now it

      • How to Bulk-Update Sales Orders in CRM

        Hi - I need to bulk update existing sales orders with dates from our ERP of when the sales orders were created. I made a date field on the Sales Order module where I want to insert that data. I can't Mass Update because I am not updating the fields to

      • Zoho ToDo in Cliq

        Our organization utilizes Zoho ToDo in the Zoho Mail Desktop app. Is there a way for these to show up in Cliq Desktop app as well?

      • 【Zoho CRM】サンドボックス機能のアップデート：カスタムビューが利用可能になりました。

        ユーザーの皆さま、こんにちは。コミュニティチームの中野です。 今回は「Zoho CRM アップデート情報」の中から、サンドボックス機能のアップデートをご紹介します。 目次 1. カスタムビューとは 2. 今回の機能アップデートについて 1. カスタムビューとは カスタムビューは、ユーザーが設定した条件に基づいてデータをフィルタリング・整理し、 重要な情報へ効率的にアクセスできるようにする機能です。 「過去15日間の見込み客」や「受注間近の商談」、「特定の優先度レベルが設定された案件」など 条件を指定してわずか数クリックで設定できます。

      • Changing an agents email address

        How do you change an agent's email address? I keep getting a red circle even though I am an admin. And on one of my agents he has two email addresses? How is that possible?

      • Zoho CRM - Potentials Tab

        Hi! When I create a Deal (Potentials tab) the header looks like this: After a refresh on the page it looks like this: What should I do so that it is displayed like in the second pic without refresh? Also I have a user that as of recently, cannot see this

      • Is there a way to automatically add Secondary Contacts (CCs) when creating a new ticket for specific customers?

        Some of our customers want multiple contacts to receive all notifications from our support team. Is there a way to automatically add secondary contacts to a ticket when our support team opens a new ticket and associates it with an account? This would

      • Unable to create embed code for resource of workdrive using API

        Hello Team, I am trying to create embed code for a resource using workdrive api in powershell, however facing some issues with injecting data in body. Followed Doc: https://workdrive.zoho.com/apidocs/v1/filefoldersharing/shareeveryone Please help, below

      • Feature Request - Insert URL Links in Folders

        I would love to see the ability to create simple URL links with titles in WorkDrive. or perhaps a WorkDrive extension to allow it. Example use case: A team is working on a project and there is project folder in WordDrive. The team uses LucidChart to create

      • not able to convert pdf to jpg and other forms and vice versa.

        i want to change my pdf to jpg, word, etc and some times jpg to pdf. i don't know how to do in this.

      • Enable / show scroll bar when Mega Menu is opened

        Hey there I am using the mega menu add-on and experience a "flicker" whenever the mega menu opens. The reason is, that the scrollbar, which has a width of a few pixels, stops showing when the mega menu opens. As the scrollbar disappears the whole page

      • Reports: Custom Search Function Fields

        Hi Zoho, Hope you'll add this into your roadmap. Issue: For the past 2yrs our global team been complaining and was brought to our attention recently that it's a time consuming process looking/scrolling down. Use-case: This form is a service report with

      • Zoho Inventory - Composite Items - Assembly - Single Line Item Quantity of One

        Hi Zoho Inventory Team, Please consider relaxing the system rules which prevent an assembly items from consisting of a single line item and outputting a quantity of 1. A client I'm currently working with sells cosmetics and offers testers of their products

      • How can I transfer data from Production to Development environment?

        Hi, I am using Creator V6 and would like to bring all the data in production to the Development and Testing environments? Is there an easy way of doing that or I have to export and import each table?

      • Add "Reset MFA" Option for Zoho Creator Client Portal Users

        Hello Zoho Creator Team, We hope you are doing well. We would like to request an important enhancement related to Multi-Factor Authentication (MFA) for client portal users in Zoho Creator. Currently, Creator allows us to enforce MFA for portal users,

      • New portal SAML authentication error: User not found

        Dears, Has anyone else been experiencing this lately? I am creating a new portal authenticated by SAML (Entra ID). I followed the same process as I did with other portals, but any new portal created after this always encounters this error. I’ve been reporting

      • Devis et facture multi page

        Bonjour, je suis sur Zoho invoice et je rencontre un problème sur mes devis et factures lorsqu'ils dépassent 1 page. je me retrouve souvent avec des lignes coupées ou le sous total page 1 et le total page 2. j'aimerai savoir s'il existe une possibilité

      • Rotate an Image in Workdrive Image Editor

        I don't know if I'm just missing something, but my team needs a way to rotate images in Workdrive and save them at that new orientation. For example one of our ground crew members will take photos of job sites vertically (9:16) on his phone and upload

      • Help with Filtering Records, HTML Pages, and Automatic File Uploads in Zoho Creator

        Hi Zoho Creator Community, I’m building a Zoho Creator application and need guidance on a few features I’ve been struggling with. I want to implement them safely and efficiently, and I’d appreciate any examples, tips, or best practices. I want users to

      • How to Send Email from within a custom module (with or without an email template)

        It is possible to send an email from the Deals module. However, I can't find a way to send an email from any of our custom modules. I have tried adding an email field to the modules (even though we don't really want one or need it there). That doesn't

      • Convert invoice from zoho to xml with all details

        How to convert an Invoice to XML format with all details

      • Feature Suggestion for Zoho Websites – Inspired by Squarespace Systems

        Dear Zoho Team, I’m a Zoho user and also a Squarespace Platinum Circle member, and I recently noticed the launch of Zoho Websites in India. I wanted to share some ideas for features that could enhance the platform for professional users and agencies.

      • Custom View - Sort by Custom Field

        I created a custom field for our Engineering team to know which tickets to work first by numbering them.  I created a custom view to general data which includes the Engineering Priority.  However, I cannot sort the Engineering Priority column ascending

      • Zoho Indeed Intergation not pulling candidate details

        We have recently integrated zoho with indeed. Prior to this our candidates came into the candidates tab via the zoho.resumes email address from indeed and it pulled through the candidates mobile number, and majority of the time a postcode. However since

      • Custom View of tickets created today

        How can I create a custom view that list all my ticked created in the current date? Currently, if I select the "Created Time" criteria, the "Current Time" option does not work as today. Actually, I don't know how it works this "Current Time".

      • Lifecycle Reports

        From data to decisions: A deep dive into ticketing system reports A lifecycle report captures and visualises the sequential states that a ticket undergoes across its lifespan. For instance, when a customer submits a support ticket for a faulty product,

      • Zoho Forms - Print Button on Forms

        Hi Forms team, I'm replicating a form for a client which is currently based on JotForm. I noticed that at the end of the form there is a button to print the completed form. I thought this would be something worth sharing and a nice to have in Zoho Forms.

      • Next Page