After processing purchase orders you get type 3 records in table tdpur051.
In many cases it happens that after a few months extra type 3 records are created.

How can this happen as the order line is already finished and cannot be changed?

BTW can you confirm that field tdpur051.ddtb in the record with ckor=3 always represents the actual delivery date (when the goods were booked)?



Transaction Record
Pur.Ord. Date Sq.No. Type Price Quantity
846534 21-apr-11 0 1 685,530000 400,0000
846534 22-apr-11 0 3 685,530000 400,0000
846534 30-mei-11 0 3 685,530000 -400,0000
846534 30-mei-11 1 3 0,000000 400,0000
846534 30-mei-11 2 3 0,000000 0,0000