Overview

Reverses a prior acceptance, restoring the proposal to its pre-acceptance status. If the system tracks prior status (SetProposalStatustoPreAcceptOrRejectAfterUndo is enabled and a PriorStatus exists), the proposal is restored to the status it held before acceptance. Otherwise, it defaults to Proposed.

What this endpoint does:

1. Loads the proposal by proposalID
2. Validates the proposal can be un-accepted (status, permission, bound policy conflict check)
3. Restores the proposal status to PriorStatus (if available and setting enabled) or Proposed
4. Logs the action via workflow log and fires a status change event