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Dynamics 365 Community / Forums / Microsoft Dynamics CRM (Archived) / Problem with creating ...
Microsoft Dynamics CRM (Archived)

Problem with creating a lookup field in existing records

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Posted on by Community Member

Hello!

I have two entities A and B, with many records in them.

entity A has 1:N relationship with entity B

Inside of entity B, I've created a lookup field that display the corresponding primary key of entity A ( It directs me to the corresponding record in entity A when i click on them)

Problem:

I want to create a lookup field in entity A that display the corresponding primary key of entity B. 

As there're already many record in entity A, how can I do this so that the lookup field I create in entity A can automatically match to the corresponding primary key of entity B in each record?

Thanks in advance!

*This post is locked for comments

  • Verified answer
    Community Member Profile Picture
    Community Member on at
    RE: Problem with creating a lookup field in existing records

    I found the answer, Sub-grid is awsome. Thank you everyone!!

    community.dynamics.com/.../microsoft-dynamics-crm-2011-form-sub-grids

  • Community Member Profile Picture
    Community Member on at
    RE: Problem with creating a lookup field in existing records

    That is a good point, I can't do it since A and B have 1:N relationship. Can I add it to Entity A's form then? let it display as a table or something

  • Suggested answer
    Aric Levin Profile Picture
    Aric Levin 30,188 Moderator on at
    RE: Problem with creating a lookup field in existing records

    Seems like you are basically looking for a 1:1 relationship that will store the values of each other entity.

    There are not real 1:1 relationships, but you would be created a 1:N relationship in each one of the entities.

    There are a few ways to do this, but you will most likely create a plugin (or two), that will take the value from one field and update the other entity.

    On Update of Entity A Lookup

      Update Entity B with value of Entity A Record Id

    You have to be careful not to run into an endless loop, since each plugin message will call the other, so you will have to control the depth or parent message name and entity in the Parent Plugin Execution Context message.

    Hope this helps.

  • Verified answer
    Community Member Profile Picture
    Community Member on at
    RE: Problem with creating a lookup field in existing records

    Hi,

    Look-up doesn't work for Entity A to Entity B since there is 1:N relationship established. Keep the Entities with no relationship and Add the Look-up of the Entities. 

  • Verified answer
    Mahendar Pal Profile Picture
    Mahendar Pal 45,095 on at
    RE: Problem with creating a lookup field in existing records

    Hello,

    Existing records can be updated by writing a console app or using excel (export/import) But the problem is - A and B have 1:N relationship, as there may be many child record for Entity A, but one lookup can show you only one child record what about if your entity A have more association with entity B records ??

    Thanks

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