Activate Event-Receiver Linkage 
The event RELEASED for the object type AFVC_PM (Maintenance order operation) is the triggering event for the workflow template WF20000031 and is entered in the event linkage table in the standard system as such. To ensure that the workflow can be started, the linkage between the triggering event and the workflow template task as the receiver of the event must be activated in the development environment for the SAP Business Workflow.
Procedure
The system displays the initial screen for the Customizing application.
The system displays the screen Display Structure: SAP Reference IMG.