Variable substitution - Pseudo Path Variable - file adapter

Hello,
I am sending an purchase order fro SRM to the file adapter and like to create an filename like purchaseordernumber.xml. Can anyone give me some help because I do not understand the sap help regarding this topic. The XML starts as follows:
<?xml version="1.0" encoding="utf-8"?>
<nr1:PurchaseOrderRequest xmlns:nr1="http://sap.com/xi/SAPGlobal/Global">
<MessageHeader>
<ID schemeID="0101">41000000290000000020051123164420</ID>
<CreationDateTime>2005-11-23T16:44:20Z</CreationDateTime>
<SenderParty>
<InternalID schemeID="PartnerID" schemeAgencyID="M06CLNT100">11</InternalID>
</SenderParty>
<RecipientParty>
<InternalID schemeID="PartnerID" schemeAgencyID="M06CLNT100">LIEFERANT2</InternalID>
</RecipientParty>
</MessageHeader>
<PurchaseOrder>
<ID schemeAgencyID="M06CLNT100" schemeAgencySchemeAgencyID="ZZZ">4100000029</ID>
regards
Stefan

Thanx,
I have tried:
var1 payload:PurchaseOrder,1,ID,1
but its not working.
Does anyone know my mistake?.
best regards
Stefan

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Taken from:
http://help.sap.com/saphelp_nw04/helpdata/en/bc/bb79d6061007419a081e58cbeaaf28/frameset.htm
Variable Substitution (Target Directory/File Name Scheme)
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sender_party, sender_service, receiver_party, receiver_service, interface_name, interface_namespace,
message_id (message ID with hyphens, for example 9fbe1ff1-9a0d-11d9-8665-cbf10a126331)
message_id_hex (message ID in hexadecimal format, for example 9fbe1ff19a0d11d98665cbf10a126331)
For example, if you want to specify the interface name from the message header in the target directory or in the file name scheme, enter message:interface_name as the reference.
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============
<?xml version="1.0" encoding="UTF-8"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40">
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<Table x:FullColumns="1" x:FullRows="1">
<Row>
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Variable Substitution:
=======================
userid          payload:Workbook,1,Worksheet,1,Table,1,Row,1,Cell,1,Data,1
filenumber    payload:Workbook,1,Worksheet,1,Table,1,Row,1,Cell,2,Data,1
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==============
0209519_32226v2 v1.1
Actual Output:
============
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Thanks for your help.

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Target XML:
============
<?xml version="1.0" encoding="UTF-8"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40">
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Variable Substitution:
=======================
filename payload:Workbook,1,Worksheet,1,Table,1,Row,1,Cell,1,Data,1
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==============
0209519_32226v2 v1.1
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============
0209519_32226v2 v1.1

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Variable substitution - Pseudo Path Variable - file adapter

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