SAP Message REORPO060 - Not possible to undo activation (see long text)

Diagnosis
It is not possible to deactivate this activated move planning. Possiblereasons are listed below:
The new occupancy data that arises from the move is already being usedin another move planning.
The new occupancy data that arises from the move was already manuallychanged or deleted.
Parts of the move planning were already archived.