Re: COALESCE

In the field INFNR there is never a null value but an empty value. So you can not use coalesce here because infnr is always set

SELECT * FROM EKPO WHERE INFNR = ''  ... returns a lot of results

SELECT * FROM EKPO WHERE INFNR is null ... returns no results

So in your case you should use matkl if infnr = ''

Best regards, Andreas