I have some more info that may help narrow down the problem:
1. The problem only occurs when I try to set a Master-Detail relationship with a main region and another region.
2. The problem only occurs when choosing a date column as one of the two master detail links.
3. I created a primary key based on a trigger/sequence. I can then connect the two interactive grids using master-detail and everything works good with no errors.
4. Error only happens when connecting one date column to another in Master Detail. (I check a dozen times to make sure both were/ are using the same Date format, size, all that.
Is this just a bug in Apex 18.2 or is it not possible to use a date column as a primary key and have it also in a master-detail relationship?
Thanks for any help....