Message mapping issue

Hi Friends,

I have an issue with development.

My Scenario is FTP to Mail adapter by using RFC Lookup.

Condition is -

Sender side - Location, Store no, PO_number, Po_date,Platform and Division (here Platform and Division are constants)

Receiver side - Mail, Subject, To, Content

Message Mapping as follows -

My issue is in sender side communication channel generate the message id and it is success but coming to SXMB_MONI I got the Error like -

Trace - Too many values in the first queue in function useOneAsMany. It must have the same number of contexts as the second queue] in class com.sap.aii.mappingtool.flib7.NodeFunctions method useOneAsMan.

Error - Runtime exception when processing target-fieldmapping /ns0:Messages/ns0:Message1/ns2:Mail/Conte

Please help me if you have any solution

Thanks

Chaitanya.