File name from an attribute of an element of the payload

Dear Experts,
Could you suggest the syntax for specifying the file name from a variable in the file receiver communication channel? I need to grab the file name from an ATTRIBUTE of an element of the payload.
Thanks a lot.
Example: Need to pass the attribute "descReceipt" of the element "promotionEvent" to the variable in the following payload:
<?xml version="1.0" encoding="UTF-8"?>
<promotionExport>
<promotionEvent eventIdentifier="30" status="A" descReceipt="FILE1">

The scenario is IDOC to FILE. I need to get the value of the receiving partner.
The message header has the node "DynamicConfiguration". Please see the xml below. I need to grab the key RCVPRN (0000002104) from this and pass as the file name in the receiver file adapter.
How do I setup my receiver file adapter for this? I tried changing the values for the variable, and also enabling the adapter specific message attributes. No solution yet.
<SAP:DynamicConfiguration xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="1">
<SAP:Record namespace="http://sap.com/xi/XI/System/IDoc" name="RCVPOR">LXDCLNT250</SAP:Record>
<SAP:Record namespace="http://sap.com/xi/XI/System/IDoc" name="SNDPRT">LS</SAP:Record>
<SAP:Record namespace="http://sap.com/xi/XI/System/IDoc" name="RCVPRN">0000002104</SAP:Record>
<SAP:Record namespace="http://sap.com/xi/XI/System/IDoc" name="SNDPOR">SAPLCD</SAP:Record>
<SAP:Record namespace="http://sap.com/xi/XI/System/IDoc" name="SNDPRN">LCDCLNT220</SAP:Record>
<SAP:Record namespace="http://sap.com/xi/XI/System/IDoc" name="CIMTYP" />
<SAP:Record namespace="http://sap.com/xi/XI/System/IDoc" name="IDOCTYP">WPDBBY01</SAP:Record>
<SAP:Record namespace="http://sap.com/xi/XI/System/IDoc" name="MESTYP">WPDBBY</SAP:Record>
<SAP:Record namespace="http://sap.com/xi/XI/System/IDoc" name="RCVPRT">KU</SAP:Record>
</SAP:DynamicConfiguration>

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// JB
Edited by: jb-from-sydney on Feb 9, 2010 10:37 PM

Thanks for your answer.
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