RFC and XI

As I said that we are working on the following scenario:

(Sender) (Receiver)

SAP R/3 <----

XI <----

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SAP R/3

4.6C RFC Adapter RFC Adapter 4.6C

We solved much of the problem except one: we don?t know how to give the meta data of the called Function Module (present in the Receiver system) in the sender system. I have imported the Function module (present in the Receiver system) into XI (in business scenario, Integration repository and Integration directory) even then I?m getting error: ?JCO Service is unable to locate the Function Module?.