Error during ANZ Batch Export of Payments – Hash Key Calculation

I am attempting to perform a batch export of payments for ANZ, but I am consistently receiving the following error message:

“An error occurred while trying to calculate hash key ",str=client_bank_account”

Initially, I noticed that the bank account number referenced in the error appeared to match one of my client’s bank account details. I attempted to resolve this by voiding that invoice and re-running the batch export (without that client). However, after doing so, the error persisted and the bank account referenced in the error message changed to the next client in the list.

This suggests the issue may not be isolated to a single client record, but rather something in the batch export or validation process itself.

Could you please advise:

What specifically triggers this hash key / client_bank_account error?

Whether there are known issues with ANZ batch exports related to client bank account data?

Any steps I can take to validate or correct the data to allow the batch export to proceed?

Thank you for your assistance.