Hi Santosh,
I would suggest you to first check if this problem is occurring in standard application by setting WCF_IGNORE_ENHANCEMT to A . Then check your custom component and verify all the enhanced methods. This might also happen if you are missing the call to super class methods in your enhanced methods. Especially when SAP had no code in super class method in old version and had come up with some code in newer versions.
Regards
Vinod