Hi,
there is no rule activity available in standard to do such updates directly in TM. If you propagate the event messages to TM like it is done in the standard scenarios (by using standard rule activity TM_MAINTAIN_EXEC_INF), you can enhance the logic in TM to update e.g. FO execution status. Please check this document for further details: SAP Event Management - Scenarios for SAP Transportation Management (chapter Updating data in TM triggered by new execution event).
Best regards, Daniel