Hi Nava,
the processing of the document distribution is always done via SAP Business Workflow. The main workflow is WS 20000104.
You can find the settings in the IMG here: "Document Distribution -> General Settings -> SAP Business Workflow".
First you should check that the WF customizing is complete (SWU3 - verify workflow customizing). The point "Activate Event-Type Linkage" activates the workflow template as proposed by SAP.
Bye,
Juergen