well usually that is the case we have seenm you can make the employee list. typically, you define the employee list for whose the travel requests are routed to,
http://wiki.scn.sap.com/wiki/display/ERPHCM/How+to+add+and+maintain+employee+list+in+WD+ABAP+scenariohttp://wiki.scn.sap.com/wiki/display/ERPHCM/Workflow+Customizings+in+Travel+Management