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

    • Function #9: Copy attachments of Sales Order to Purchase Order on conversion

      This week, we have written a custom function that automatically copies the attachments uploaded for a sales order to the corresponding purchase order after you convert it. Here's how to configure it in your Zoho Books organization. Custom Function: Hit

    • Kaizen #8 - Handling Recurrence and Participants in the Events Module via API

      Hello everyone! We are back this week with an exciting post—Handling recurrence and participants in the Events module through API. First things first—What is the Events module? "Events" is a part of the Activities module in Zoho CRM.  An event is an activity that happens at a given place and time. You can find Events on the user's Zoho CRM's home page, Activities home page, Calendar, and in other related records. What are the types of Events? Events are of two types—Recurring and non-recurring events.

    • Marketer’s Space - Get Holiday-Ready with Zoho Campaigns

      Hello marketers, Welcome back to another post in Marketer’s Space! Q4 is packed with opportunities to connect with your audience - from Halloween, Black Friday, and Cyber Monday, to Thanksgiving, Christmas, and New Year. In this post, we’ll look at how

    • Personalized demo

      can I know more about the personalized demo we are construction company and

    • User Filter not selecting All Items

      We are encountering 2 issues when using the user filter. When users are trying to search using the filter option, the OK button is grayed out. Users have to unselect or make a change before it filters properly. 2. When filtering and the OK button works,

    • Can I collect email addresses in a form??

      Can I add new subscribers to my email list (hosted in FloDesk) when they check a box and add their email address on a Zoho form?

    • Zoho CRM Android app updates: Kiosk and multiple file upload support for subforms

      Hello everyone, We've rolled out new enhancements to the Zoho CRM Android app to bring better mobile CRM experience and efficiency. Let's take a quick look at what's new: Kiosk Multiple file uploads for subforms Kiosk Kiosk is a no-code tool in Zoho CRM

    • Alerts for mentions in comments

      We are testing the use of Writer internally and found that when a user is mentioned in a comment, there is no email alert for the mention. Is this something that's configurable, and if so, where can we enable this option?

    • Subform Disabled Fields Should Remain Disabled on Edit/View

      Currently, when we disable a subform field using on user input or on add new row, it works perfectly during the initial data entry. However, when the record is saved and reopened for viewing or editing, these disabled fields become editable again. This

    • Weekly Tips: Manage External Images in Zoho Mail

      When you receive emails every day, whether from clients, newsletters, or services, many of them contain external images that automatically load when you open the message. While this can make emails look more engaging, it can also impact your privacy and

    • Is it really true that I can't set the default 'deposit to' account in 2025?

      I've been using Books for 7 years and the default account has never been a problem. I usually manually reconcile invoices and have never had a thought about which account. It has always been my account. However, I recently noticed that for the past 4

    • Standard Payment Term is not pulled from account to quotation

      Hey Team There seems to be something off. I do have "Net 30" as my default payment term in Zoho Books for my customers. If, from the customer overview or quote section, I create a new Quotation, the payment terms field stays blank and doesn't get the

    • OAuth integration issues

      I'm experiencing persistent OAuth errors when trying to connect Make with Zoho API. I've tried multiple approaches but keep encountering the following issues: First error: 'Invalid Redirect Uri - Redirect URI passed does not match with the one configured'

    • Zoho Mail Android app update: Manage folders

      Hello everyone! In the latest version(v2.9) of the Zoho Mail Android app update, we have brought in support for an option to manage folders. You can now create, edit, and delete folders from within the mobile app. You can also manage folders for the POP

    • Shortcut to fill a range of cells

      Good evening: I'm writing because I haven't been able to find a feature that allows you to select a range of cells, type in one of them, and then use a key combination to type in all of them. In Excel, the keyboard shortcut is Ctrl+Enter. I haven't found

    • Get Zoho Mail API working (including DRE Connector, Oauth Token, ZUID, ZOID & ACCOUNT_ID)

      Disclaimer: I’m not a professional coder! Do you need to use Zoho Mail API? Me too. It lets you do all sorts of things — like reading the complete header of an email, or forwarding an email with its attachments — which is what I wanted to do. But setting

    • Revenue Deferrals

      Does ZOHO books and subscriptions handle Revenue Deferrals?   

    • Can I make a website open inside Zoho whenever I log in?

      Hi Zoho Team, Every day, I check a few websites for updates, for example, Rojgar--result, where I see the latest government job results and notifications. I was wondering if there’s any option in Zoho to make a website like that open inside Zoho whenever

    • Zoho Analytics & SQL Server - Live connect

      Below are the steps I did Created a fresh database and table in my own virtual server Created a new data source connection with live connect I was able to select the tables and created the data source successfully I am getting the error when I try to

    • Kaizen #214 - Workflow APIs - Part 2

      Welcome back to another week of Kaizen! Last week, we discussed how Zylker Cloud Services used the Workflow APIs to discover and audit all the automations in their CRM, listing every workflow, checking triggers, and understanding their automation limits.

    • Playback and Management Enhancements for Zoho Quartz Recordings

      Hello Zoho Team, We hope you're all doing well. We would like to submit a feature request related to Zoho Quartz, the tool used to record and share browser sessions with Zoho Support. 🎯 Current Functionality As of now, Zoho Quartz allows users to record

    • Zoho CRM Community Digest - September P1 | 2025

      Hello Everyone! September's Here! Before we jump into product updates, and community highlights, here's a quick spotlight! Zoho has launched a Professional Sales Rep Certification course on Coursera, tailored for sales professionals to strengthen their

    • Upload my theme.

      Hello. I would like to upload my own theme, this one: https://themeforest.net/item/panagea-travel-and-tours-listings-template/21957086 Is it compatible and where I upload it? If not I will hire a developer, what do I have to ask when I search for one?

    • Explore the Redesigned Quotes Module in Zoho Billing

      Dear users, We’re excited to introduce a refreshed look for the Quotes details page in Zoho Billing! This update brings you a more efficient user interface experience without changing your existing workflow. We've enhanced layouts with organized tabs,

    • Default/Private Departments in Zoho Desk

      1) How does one configure a department to be private? 2) Also, how does one change the default department? 1) On the list of my company's Zoho Departments, I see that we have a default department, but I am unable to choose which department should be default. 2) From the Zoho documentation I see that in order to create a private department, one should uncheck "Display in customer portal" on the Add Department screen. However, is there a way to change this setting after the department has been created?

    • Product Updates in Zoho Workplace applications | September 2025

      Hello Workplace Community, Let’s take a look at the new features and enhancements that went live across all Workplace applications this September. Zoho Mail Attach email as EML file in Compose Effortlessly attach emails as EML file in Compose by simply

    • 🤝 Rencontres, partage et inspiration au Zoho Community Meetup de novembre

      Chers utilisateurs, Bonne nouvelle 🎉 : notre Meetup Zoho Community approche, et nous serions ravis de vous y voir ! 📍 Toulouse : le 25 novembre 📍 Lyon : le 27 novembre (🎯 Il ne reste que quelques places !) Que vous soyez débutant ou utilisateur avancé,

    • Need Help Mapping GST Registration Number Field Between Zoho Books & Zoho CRM + Slow Sync Issues

      am facing an issue with field mapping between Zoho Books and Zoho CRM. I want to map the GST Registration Number field from the Customer module in Zoho Books to a custom GST field inside the Accounts module in Zoho CRM. However, I am getting a warning

    • Notification received when self-assigning tickets

      When I assign tickets in Zoho Desk the relevant agent gets a notification email. When assigning myself a ticket in Zoho Desk, I get a notification email. Now, as I am the person who assigned the ticket to myself, getting a notification in this regard

    • Nouveauté dans Zoho Writer - Création de documents et de modèles assistée par l'IA

      Zia, l’assistant IA de Zoho Writer, soutient les utilisateurs dans l’amélioration de leur écriture et la création de contenus : correction orthographique et grammaticale en temps réel, suggestions adaptées au contexte, détection du plagiat, révisions

    • When moments in customer support get "spooky"

      It’s Halloween again! Halloween is celebrated with spooky symbols and meanings based on history and traditions, with each region adding its own special touch. While we were kids, we would dress up in costumes along with friends, attend parties, and enjoy

    • Session Expired

      I constantly get "Session Expired" and need to relogin or close and open the application again. This gets really frustrating during the day. Is this something that can be solved? This really makes me want to leave the app as it is no go to need to reopen

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

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

    • Disable Buttons for Users with Profiles without permission

      Hey, I've noticed that users without permission of setting up things in the marketplace, can still see the icon: On a click, you see this: It would be way better, if they couldn't see this menu icon at all. (Aside from the fact that it completely misplaced

    • Mapping a new Ticket in Zoho Desk to an Account or Deal in Zoho CRM manually

      Is there any way for me to map an existing ticket in Zoho desk to an account or Deal within Zoho CRM? Sometimes people use different email to put in a ticket than the one that we have in the CRM, but it's still the same person. We would like to be able

    • Zoho製品と生成AIツールの活用について

      いつもありがとうございます。 弊社では、Zoho Oneを契約し、CRMを軸として、見込み客の管理から商談、その後の受注や請求の管理、サポート業務（Desk）、業務データのレポーティング（Analytics）などを行っております。 Zohoサービス自体には、Ziaというツールが搭載されているかと存じますが、それ以外の外部の生成AIツールと連携した活用などもできるのでしょうか？具体的には、CopilotなどがZohoに登録されているデータや情報を見て、対話型で必要なデータを提示してくれたり、商談や蓄積されたメモなどを分析してユーザが知見を得られるような活用ができないか、と考えております。

    • Zoho Analytics - Make text clickable in underlying data

      Hi Community, I have a simple sales report based on a Invoice query table. I have included a link on to each invoice on the table and sent the Invoice number URL to the link. This works find in the query table, but when I click underlying data on the

    • Credit Management: #5 Advanced Refund Policy

      You're subscribed to a well-known SaaS design tool. You've used it to manage your team's projects, create marketing visuals, brochures, and so on. But your needs change over time. Your company may switch to another tool or hire an in-house designer who

    • Exported Slide Image Lacks Portion of the Background Image

      This does not always happen, but when I export (or "download") the rendered image of a slide, it sometimes lacks a portion of the background image. I created a sample slide deck to demonstrate it and shared it with the admins. It is also publicly available

    • How to create a Zoho Mail extension similar to Outlook's OnSend add-in?

      Hi, I want to create a Zoho Mail extension similar to Outlook’s OnSend add-in. The extension should: Let the user select headers and footers from a taskpane while composing an email. When the user clicks Send, the extension should: Automatically insert

    • Next Page