Do you have a SQL statement specified for after writing by any chance? Is the data actually being written?

Yes, but wouldn't that run after all output has been written? In my case I should have 80K "ledning", but only gets 17K.

My SQL run after translation is fairly straight forward:

UPDATE f$(TARGET_SCHEMA)].oAfløbskomponent] SET Sgeometri] = Ãgeometri].MakeValid() WHERE igeometri].STIsValid() = 0
UPDATE g$(TARGET_SCHEMA)].(Afløbsledning] SET Âgeometri] = Cgeometri].MakeValid() WHERE Âgeometri].STIsValid() = 0

 

UPDATE f$(TARGET_SCHEMA)].oAfløbskomponent] SET Sgeometri] = Ãgeometri].MakeValid() WHERE igeometri].STIsValid() = 0
UPDATE g$(TARGET_SCHEMA)].(Afløbsledning] SET Âgeometri] = Cgeometri].MakeValid() WHERE Âgeometri].STIsValid() = 0

I did manage to get the correct output without encountering any errors, but I had to single-step the entire workspace !!

During my trials I encountered another peculiar error that I haven't seen before:

 

I believe that second error relates to the feature caching not finding a cached feature. I wouldn't worry about that one too much...

 

I'm closing this question, there seems to be no obvious explanations.