I have two tables (A, B) associated with a 1-to-many multiplicity. In the overview page of Table B, I want to make the association mandatory. In other words, I want to trigger a message if the association is empty like normally happens for a ‘REQUIRED’ field in the table. Is there somewhere a setting I’m missing, or this must be achieved only with a microflow? Thank you.
You aren't missing a setting. You can only validate an association through a microflow.
You could set the microflow as before commit event handler to force the validation in all cases