Inbound Processing Using SAP
Workflow 
This section shows how to use workflow to process inbound IDocs, instead of using direct input via function call.
We recommend using direct input via function call rather than workflow for inbound processing because of the performance overhead of invoking workflow for each inbound IDoc or IDoc packet.
Using Workflow makes sense when each IDoc of a given message type and/or from a given sender needs to be manually processed, or the subsequently created application object needs to be manually processed, but only when created from an IDoc. Example: For message type ORDCHG (order change) an enterprise decides that when a customer (sender) changes an order, these changes must be checked by the responsible employee before the order is updated.
Inbound function modules implemented as described above support inbound processing via workflow in addition to error handling via workflow. No changes are required.
The two subsections deal with the two different ways of processing inbound IDocs with workflow: Work items and workflow.
See also:
· Workflow