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Error message EA(408): "interface for the function xxx is incorrect"

I have implemented outbound program and inbound function module for a new basic IDoc type. Outbound process is successful. But while I am trying to execute the inbound function module I am getting this error message: "interface for the function module is incorrect". What could be wrong here? I am not using message control. Is the process code necessary to execute the function module? I didn't create it.
When dealing with inbound processing the message control is irrelevant, this is only used if an outbound IDoc has to be triggered through messaging.

The processing code, however, is always needed for inbound processing. It is used to determine the name of the function to handle the IDoc. I am not sure if this is the only error. The error message you mention, I assume it is EA(408) indicates that the function module has invalid calling parameters. Set a break-point in MSED7F05 at CALL FUNCTION 'FUNCTION_IMPORT_INTERFACE' and debug from there to see what may be wrong.

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