We installed the latest updates and service packs: AR V9.2A (170711), EFT V9.3A (170624), Ledger V9.3A (170625), AP V9.3A (170623). The installation went fine.
The first batch to be retrieved from the AP module created the message:" ERROR retrieving batch APALBTCH. Your data may be damaged please restore from backup."

The transactions are posted to the AP subledger.

Is there another option other than restoring from back up ?

Thank up