SAP Message AA452 - Posting not possible (line items from down payment not available)

Diagnosis
You tried to transfer a down payment for the asset & &. In order tocorrectly process the transaction, the system tried to read the lineitems belonging to the downpayment posting. This attempt to read thenecessary line items, however, showed that they are no longer in thesystem.

System Response
Transfer is not possible.

Procedure
Please contact your system specialist.