Accounts Receivable and Accounts Payable Supplier/Customer bank detail sharing

I have an issue with AR and AP not seeming to be able to share Supplier Bank Details

Organisation Bank Details set up in AP

Refund due through AR

Bank Details error as duplicate (because they exist in AP) but do not pull through

These suppliers are then paid by cheque as we cannot pay by BACS/WIRE as we cannot add the details in.

Advice given has been to

Create a new site with the bank details however this does not work as the details are still seen as duplicate

Untick the 'Allow Change to Printed Transactions' however this means that any remittance can be amended - not acceptable to us