A purchase order had 50 lines, which were received in and paid at different times.  The purchase order was finally received in totally and closed.     One of the AP-C invoices had to be voided.   I reopened the PO in PO-D.   I then went to unrecieve it and I can only see the first 20 lines on the purchase order.    Howevrer all 50 lines appear in PO-D.  I need to unrecieve line 39 and 40.
 
 
Also, I think I have read that I cant just edit lines 39 and 40 on the po.  I must enter brand new lines with a negative amount