inbound idoc status 51 even if everything seems correct

Hello all,

For system Q7G in profile allocation data exchange, the outbound idoc in client 940 shows status 3 while the corresponding inbound idoc in client 945 shows status 51 and it says 'IDoc from category UTILMD was not processed'.And the data in the inbound idoc looks correct. The function module, message type and basic type,  partner profiles are also correctly maintained. Port are also maintained in both the systems.

And when I go to we19 and give the same function module there to process the inbound idoc, it says "interface for the function module is not correct" 

Could anyone please suggest the solution for this issue?

Thanks and best regards,

Akshay Kumar