Overview

Reverses a rejection, restoring a proposal from Rejected status back to its prior status. By default, the proposal is restored to Proposed. If the SetProposalStatustoPreAcceptOrRejectAfterUndo setting is enabled and the proposal has a saved PriorStatus, it is restored to whatever status it was in before it was rejected.

What this endpoint does:

1. Loads the proposal by proposalID
2. Validates the undo is allowed (permission, status, business rules)
3. Restores the proposal to its prior status (or Proposed by default)
4. Reverts related policy change records
5. For renewals: handles book-of-business transfer undo
6. Logs the action via workflow log and fires a status change event