Who this covers
The contact at a vendor: the address a purchase order is emailed to, which is often a named person's. Requesters and approvers are your own users. The vendor itself is a business, and its name on requests and purchase orders is your procurement record.
1 · Subject access — export everything held
2 · Erasure — remove a contact's address
The address is replaced with [removed] on the vendor, in the purchase-order send log, and inside the request-history lines that say where a PO was emailed.
The vendor, its requests and its purchase orders stay. Who asked, who approved, what it cost and when are the approval record. Approva refuses while a request for the vendor still awaits its decision or its purchase order, because that PO would be emailed to this address.
Kept: the audit trail's copy of each line saying a purchase order was emailed to this address, because the audit trail cannot be edited.