Operation Mapping - Missing parameter SenderInterface

hi together,
i wanna test a java mapping within a operation mapping. in the java mapping i wanna do something different regarding to sender interfaces (for interface A i wanna multiply; for interface B i wanna decrease a number for example):
here a part of my coding:
in function module: transform
messageHeader = arg0.getInputHeader();
mySenderInterface = messageHeader.getSenderInterface();
in the operation mapping itself, at parameters, i have the most of the parameters, but not the SenderInterface...
is this a bug of SAP PI?
many thanks
alex

Check the runtime constants available for java mapping-
http://help.sap.com/saphelp_nw04/helpdata/en/e2/e13fcd80fe47768df001a558ed10b6/content.htm

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Operation Mapping - Missing parameter SenderInterface

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