Mapping execution error

Hi XI gurus

Plese provide solution to my problem

I am getting run time exception in mapping exeution while checking in "sxmb_moni"

when i am checking under payload for main document i am not found data getting an error of XML page refersh to view even i am refershing i amnot able to see the data.

Actually in my is "Orders acknowledgement from oracle to sap" here we use BPM

with send and receive step bases on the condition in "ReciverDetermination " ack goes to that system.In mapping part we also use RFC lookups als

even for successfully processd messages of this scenario also iam not able to find data in moni.

please provide solution whether am i checking in wrong area or where might be the problem

Thanks in advance

Rao.