A maintenance adjustment transaction (MR11) was executed to 'write-off' the open receipts on a purchase order. All purchase order items have the same accounting (Profit Center, GL Acct, Comp Code). The MR11 transaction creates a KP (account maintenance document) which is posted against the PO line and is cleared against the receipt accounting document(s).
A clearing document should be created to offset the receipt/invoice document with the maintenance document.
For some reason, part of the items that were 'maintenanced' on the PO did not get cleared, while other items did get cleared. Our internal SAP GL super users have reviewed the documents and cannot understand why some of these did not clear.