PO changes communication to Suppliers

We would like to manually control the communication to Suppliers on PO changes. Only the original PO should be automatically communicated to the Supplier and the subsequent revisions should be suppressed with Procurement team having the ability to send such changes as and when needed. Currently if we change the buyer then a new PO version is created and email communication is going out to Supplier and they are accidentally treating this as a new PO and fulfilling this. Is there a way to stop the automatic communication to Supplier on PO changes without touching the workflow? If the workflow