How to pass the mail body to RFC structure

Dear Experts,

      I have completed the development Mail->PI-->RFC,I can able to process the From,To,Subject - to RFC structure perfectly using standard mail sender xsd by external definition.

But issue with body of the mail.

Mapping structure:

Mail sender:

Receiver RFC in SXMB_MONI:

How to take the body of the mail separately and pass it to RFC without improper content.

Is there any proper structure or module config to handle this issue.

Best Regards,

Monikandan.