Error in RFC channel -failed to read funtionname from XML document: missing namespace declaration(1)

Hello All,

I have a scenario JDBC->PI->RFC

where i am uploading BOM data to SAP.

I am getting error in receiver RC channel

Message processing failed. Cause: com.sap.engine.interfaces.messaging.api.exception.MessagingException: com.sap.aii.adapter.rfc.afcommunication.RfcAFWException: error while processing message to remote system:com.sap.aii.adapter.rfc.core.client.RfcClientException: could not get functionname from XML requst: com.sap.aii.adapter.rfc.RfcAdapterException: failed to read funtionname from XML document: missing namespace declaration(1)

RFC    ZMM_BOM_UPLOAD  is a customized RFC which my abap guy has created for me.

Payload in SAP looks as below:

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

Please suggest how to remove this error