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Dataverse (MDA): Suddenly cannot change custom activity date fields to "date only"

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I'm working on a model driven app which uses a lot of different custom activity tables, in a custom solution. Up until this week, I was able to change the fields "scheduledStart" and "scheduledEnd" from "date and time" to "date only". However, as of this week, that is not possible.
 
I have five custom activity tables from before this week, where these two columns are correct (date only). When I try to do this with the remaining custom activity tables, I get the following error:

"cannot modify the behavior if canmodifybahavior is set to false for OOB date time attributes of a custom entity"
 
I cannot see any updates in Dataverse or Power Apps that would explain this. Has anoyone else experienced this? Or does any of you know of a solution? There is no mention of "canmodifybahavior" anywhere that I can find. I've tried looking at the documentation, but the only thing I can find seems to say that I need to import the solution with modification enabled(?). But it worked up until this week, so that doesn't really make sense to me. And I don't want to do that until I know this is the correct path. 
  • MariusHT Profile Picture
    MariusHT 18 on at
    Dataverse (MDA): Suddenly cannot change custom activity date fields to "date only"
    OK, so this is embarrasing - I once again tried using the classic experience (per this walkthrough, as I've done before). I don't get an error using the classical experience, but neither does it update the field to "date only" in the classic experience fields list. It still shows as "date and time".
     
    However, when I switched back to the modern experience, the field was correctly set to "date only". It seems to be a bug in both the classic and modern experience(?).
     
    Changing the column in the modern experience still throws the error mentioned above. So a workaround seems to be to use the classic experience for this particular function.

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