A couple of things...

Make sure you have the latest service of AP 9.3A, dated 4/22/18, installed.

The file APALBTCH.DAT contains the transactions that are waiting to be retrieved into Ledger. Once those transactions are successfully retrieved, the file gets deleted (and then starts building up again as more transactions are posted).

The file does not have a link to any other files in Payables, so if you were to restore it, you would not cause any data corruption. But you would likely end up with missing or duplicate transactions in Ledger unless you know exactly what you are doing.

However, before you do anything, print the Print/Consolidate GL Transactions report under Payables | Reports, even if just to screen, so you can see what transactrions are not being successfully retrieved. In my experience, even if the file is corrupted, the report still prints. Then rename the APALBTCH.DAT file so the problem doesn't compound.

If the report is short, you might want to enter the transactions directly in Ledger. If it is too long to enter, contact your Adagio consultant and they should be able to reconstruct the Ledger transactions. Or have your consultant contact me at steve@sschwartzcpa.com

Steve Schwartz