The pop-up message is often truncated. To see the real cause:
A: No. Ignoring it or using backend SQL to force a status change can break financial integrations, duplicate POs, or cause invoice mismatches.
A: The error is deterministic. If it worked before, something changed—either the PO’s state, your permissions, or a related master data element (like a vendor or account code).
Sometimes the UI misleads users. For example:
Read the exact wording of buttons. If you see a button like “Complete Action” or “Process,” try that instead of the generic “Save” or “OK.”