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Basic Form Subgrid Configuration for Power Pages

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Posted on by Court1

Hi all,

It is my first time configuring a basic form with a subgrid & I am having an issue where the subgrid will not show on the portal, however it shows as expected in the design studio (screenshots below):

I have the subgrid configured in the metadata of the Main Form. Please see below for further details of how I expect the forms to work.

1. Form A in Table A will create a new record where the user fills in the below fields:

2. Underneath these fields, the subgrid will display the data set for the specific View from Table B. This is showing as I would like in the Basic Form setup:

3. Records from the subgrid can be edited by clicking edit in the subgrid, then using Form B to edit these records in the PSI Evaluations table.

Any assistance would be greatly appreciated as I have been stuck on this for a while now.

Thank you

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Microsoft Dataverse with Power Apps

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Fubar 8,338 Super User 2025 Season 2 on at

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For future reference, the forums for Power Pages questions are here https://powerusers.microsoft.com/t5/Get-Help-with-Power-Pages/ct-p/mpp_gethelp

To answer your question, is the Basic Form an Insert form (i.e. creating a new record, not editing an existing record)? if so, the Subgrid cannot be rendered until after the record has been inserted/created - this is the same as a Subgrid in a Model Driven App and is due to the records in the Subgrid being linked to the parent record by its internal GUID (which does not exist until after the initial insert/create).
Some possible ways around the issue
Split the Form into multiple forms e.g. put your (1) without subgrids on one form as an Insert, your (2) with the subgrids (or Subgrids and also the the info in your 1) on another form as an Edit and in the form definition of the first form set the On Success to Redirect to the Page with your 2nd form on it, and set .Append Record ID To Query String; on the 2nd form set its Record Source Type to Query String: id https://learn.microsoft.com/en-us/power-apps/maker/portals/configure/entity-forms
or Use a Multi Step Form (a.ka. Advanced Form a.k.a. Web Form) and use Steps with the subgrids on Steps after the initial insert step https://learn.microsoft.com/en-us/power-apps/maker/portals/configure/web-form-steps

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Court1 8 on at

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Hi @Fubar
Thanks very much for your response, this was very helpful. I've now configured this as a multistep form & all seems to be working as expected, however when clicking Submit I am getting this error, any ideas what could be causing this?

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Fubar 8,338 Super User 2025 Season 2 on at

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Error is a generic error, often (but not always) it is caused by a plugin or workflow failing.
Couple of ways you can see more details are described on this page https://learn.microsoft.com/en-us/power-apps/maker/portals/admin/view-portal-error-log

(if you decide to turn on the Diagnostic the Error Id you see on the screen is the id in the log)
(If its a plugin/workflow you can also look at Plugin Trace Log (if turned on) and the Process Sessions table,)

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