Hi, I just came across a caveat while using the feature "allow creation of records in this table via this relationship" in the relationship-graph.
If you build up your relation with a global field in table A in order to create records in table B, make sure table A contains at least one record. Even if you are never going to use this record. Otherwise FileMaker will return the error "record missing" and just not create a new record in table B.
(use case for an empty table: when using a separate table exclusively for global fields)