You're very right, Jörg, it won't work your way. Try changing

PT_AUFNR_INTERN=PT_AUFNR_INTERN; PT_AUFNR_INTERN DESC

to

PT_AUFNR_INTERN=4; 4 DESC

or

4=4; 4 DESC

I'm not quite sure how many places you have to replace PT_AUFNR_INTERN by
4, but if you try you'll quickly get it to work.

Set