Power Apps Portals: Related Records Filtering on Lookups When Creating Records via Subgrid
The power of Entity Forms in Power Apps Portals is that they mirror much of the functionality available in model-driven apps (and Dynamics 365). While the parity isn’t 100%, one advanced feature that Entity Forms does support is Related Records Filtering on lookups, where the available options in the lookup are filtered by some other data that has already been selected. However, in certain cases, this functionality doesn’t offer exact parity out-of-the-box – one of those cases is when you are creating a new record via a subgrid, and you’re expecting that the parent record is used in the filtering of the lookup.