message "INTERFACE_REGISTRATION_ERROR"

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Hi All.

I got some problems when I try to post data using HTTP ---> RFC in R3 (Customized RFC function) and I also create proxy but it still got a return as show below:

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

- <!-- Call Inbound Proxy

-->

- http://sap.com/xi/XI/Message/30" xmlns:SOAP=" http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="1">

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

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

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

<SAP:P2>MI_FileName</SAP:P2>

http://sap.com/xi/XI/DataTransfer>

<SAP:P4 />

<SAP:AdditionalText />

<SAP:ApplicationFaultMessage namespace="" />

No implementing class registered for the interface (ABAP interface, request message MI_FileName, request message, namespace http://sap.com/xi/XI/DataTransfer) >

<SAP:Retry>N</SAP:Retry>

</SAP:Error>

Did I miss any step? Thank you in advance.