INTERFACE_REGISTRATION_ERROR (No implementing class registered for the int)

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I am trying to load items into the catalog using the program BBP_CCM_TRANSFER_CATALOG. We are using CCM 2.0 on SRM 5.0. After I execute the said program, an XML is sent to XI from SRM through the proxy interface CatalogUpdateNotification_Out. XI should then, in turn, send back the XML through the proxy interface CatalogUpdateNotification_In.

When we try to do this, we get the error INTERFACE_REGISTRATION_ERROR for the CatalogUpdateNotification_Out interface in XI.

<i><SAP:Category>XIProxy</SAP:Category>

<SAP:Code area="ABAP">INTERFACE_REGISTRATION_ERROR</SAP:Code>

<SAP:P1>ifmmessif</SAP:P1>

<SAP:P2>CatalogUpdateNotification_Out</SAP:P2>

http://sap.com/xi/EBP>

<SAP:P4 />

<SAP:AdditionalText />

<SAP:ApplicationFaultMessage namespace="" />

No implementing class registered for the interface (type ifmmessif, name CatalogUpdateNotification_Out, namespace http://sap.com/xi/EBP )

<SAP:Retry>M</SAP:Retry>

</SAP:Error></i>

I have checked the namespace of CatalogUpdateNotification_Out in SRM and XI, and they are both under the namespace http://sap.com/xi/EBP. I have also tried regenerating CatalogUpdateNotification_Out in SRM.

We have also configured the SRM System as an Application System (in SXMB_ADM), and XI as the Integration Server.

Would any of you know how to help us?

Regards,

Glenn

PS. As usual, points galore for helpful replies!:))