how to release bulk invoice hold via the hold negociation workflow? (BPM automatic action)

Summary:

Need to release existing invoice hold (not yet released and manually releasable) automatically when condition are met

Content (please ensure you mask any confidential information):

Suppliers are set with hold put on invoice when it is not matched to any PO (usual business and best practice).
When not matched to any PO, the invoice from such supplier receives the PO REQUIRED hold.
Few invoice are identified as exceptions for not being PO matched in customer context.
Business context: PO is closed and has not been converted. Customer experience an unpaid invoice from the data conversion process.
Business requirement: automatically release