various table loockup field

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Posted on by Kesh

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Hi everybody,

I have an issue with a specific dataverse architecture:

I have 4 tables:

- Project

- Sub project A (with 9 columns) with a Project loockup field

- Sub project B (with 17 columns) with a Project loockup field

- Sub project C (with 5 columns) with a Project loockup field

- Comments

Each sub project are different an defines sub-projects very differents from sub project A to C. This is why I cannot group sub projects in a single table.

just a little sketch:

Comments can be done on sub project A, B or C and also on projects.

How could I (in an elegant way) link comments to various tables avoiding having 4 loockup fields ?

Thank you for your help

kind regards

Quentin

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Microsoft Dataverse with Power Apps

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Ram Prakash Duraisamy 5,593 Super User 2025 Season 2 on at

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Hello @Kesh

As you have Mentioned it is LINKING, so Linking will be happened with a REFERENCE, so we need a Reference LOOKUP field here in each entity

Please mark as Answer if it is helpful and provide Kudos

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Guido Preite 1,488 Super User 2024 Season 1 on at

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from your post is not so clear the architecture you want to achieve, but if you are looking for a solution where inside a project you want to associate a SINGLE record that can be A, B or C you can use a polymorphic lookup.
Polymorphic lookups are a special type (think of them like the Customer lookup where you can associate an Account or a Contact) and right now can be created with a tool like Polymorphic Lookup Creator (inside XrmToolBox)
hope it helps

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Devikumari Krishna 988 Super User 2024 Season 1 on at

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Hi @Kesh,
Can you elaborate your purpose for comments field? Is it going to be a free text to get the user comments at project or sub project level? or It is going to be some pre-defined values which user needs to pick from list at project/sub project level?? I assume you are trying to achieve from pre-defined values. In this scenario as @rampprakash suggested you need to use look up fields at each entity level.

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Drew Poggemann 9,287 Most Valuable Professional on at

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Hi @Kesh ,

One thought here is to create the Comments table as an "Activity" Type Table. This will allow you to attach the Comments table to any of the different sub project tables (and other tables) without having multiple lookup fields. Just like an Email and a Task can relate to multiple tables the same thing with the Comments table.

The next step would be to be able to show the rollup view of all of these Comments on the Project table in a grid I expect... The Rollup View for Activities does not work out of the box unless it starts with Account or Contact entity so you might want to look at this PCF control (https://pcf.gallery/pcf-grid-activity/) as an option or do something custom to show the related activities from your child sub project tables.

If you do go down this path, please review security as this is different for Activity tables vs. Standard tables

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Drew Poggemann 9,287 Most Valuable Professional on at

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Hi @Kesh ,

Please review the following as well with Polymorphic Lookups... Might be better option but not sure if this is still in preview... https://readyxrm.blog/2021/07/15/using-multi-table-lookups-polymorphic-relationships-in-microsoft-dataverse/

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