I have a custom entity "Member" that has a Lookup field named POC to the Contacts table, as well as a many to many relationship to the Contacts as well. On the Member form I have a Sub-Grid where they can add as many contacts to the member, such as a back up contact for when the POC is out.
I am looking to have a Lookup column filtered by ones that are related through being selected through the POC as well as the Additional Contacts within the Sub-Grid using the many to many relationship.