Payload empty at Inbound in Sender RFC

Hello Experts,

   we have a scenario RFC - > PI -> JDBC. When we are firing the scenario from ECC the payload is comming empty ie not generated. The transaction is seen in SXMB_MONI without payload as follows:

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

</rfc:ZNV_ORGMOD>

I tried with different RFC destination and also with different rogram ID. But still the problem is same . Can somebody guide me on this.

Thanks

Regards

Rajesh