We're getting a few PO receipts each month which DBA is not processing correctly.  These items have been used for more than 5 years and have the same Item Class and Account codes as always.  In one case, the item went to RNI account but not expense account (missing account - unbalanced GL batch).  This entry did NOT go into inventory - had to be corrected by adjustment.  In the other case, the item's expense went to Undistributedm, but at least the item was in inventory.
 
Any ideas on why this started happening?