Using the database, I would check that all the records in the
relationshiptype table have their
to_relationshipconstraintid set (and that those exist in the
If you don’t have too many relationship types, maybe it’s easier to click through them in the maintenance app though (open the maintenance app and navigate to the relationship type management and click through the entries until one of them gives you errors or are missing either the
from constraint or the
When you find the relationship type(s) with missing constraints, I would open them in the maintenance app and set the correct from- and to constraints.
If you can’t figure it out and you’re willing to share your relationship metadata, we can try to export the metadata for me (or someone else here) to have a look.
Let me know how it goes.