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BP Server Developer's Guide
Messaging workstep : Message subscriber workstep : What if the received message is invalid? : Workstep State
Workstep State
The Message Subscriber Workstep (MSW) is in a WAIT state until the subscribed message is received. The MSW goes into activated state as soon as the message is received because it is not waiting for the messages as a condition to activation. Hence, in MSW, when the messages are consumed and the handler is invoked, the workstep is in activated state.