There are couple of weblogs already posted explaining as to how to use Variable Substitution for 'File Name Schema'. In this weblog i will explain as to how we used the variable substitution feature for 'Target Directory'. One of the requirements in my project is to post the output-file to a particular folder. The folder format is as follows, /usr/sap/target(SID of receiver system)/output The SID of receiver system, changes as we move from development to staging, production etc. So we had to make it dynamic. For dev box the folder would be, /usr/sap/targetX10/output For staging box it would be, /usr/sap/targetX20/output and so on... So you can see that only a part of the folder is dynamic. We achieved that by using a variable which refers to the attribute of the message header, in our case it was,message:receiver_service(in our case the receiver_service is also the SID) The figures below illustrates as to how went about doing it, 
Couple of points to note, 1) Variables can refer to attributes of message header, by adding the prefix message:The message header attribute supported are,sender_partysender_servicereceiver_partyreceiver_serviceinterface_nameinterface_namespacemessage_idmessage_id_hex 2) Variables can refer to an element in XML schema, by adding the prefix payload:
Couple of points to note, 1) Variables can refer to attributes of message header, by adding the prefix message:The message header attribute supported are,sender_partysender_servicereceiver_partyreceiver_serviceinterface_nameinterface_namespacemessage_idmessage_id_hex 2) Variables can refer to an element in XML schema, by adding the prefix payload:
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