Hello Thorsten,
I'm also curious, what the source of our problem was.
Sad, that the catalog check did not recognize the problem.
I'm not aware of any tables with named primary keys.
There was none on the table that led to the problem.
I tried:
select * from constraints
where constrainttype = 'KEY' and constraintname <> 'SYSPRIMARYKEY'
It returned nothing.
Regards,
Bernhard