RuntimeException in Message-Mapping transformation

Hi Guys,

My scenario is IDoc to XI . We got runtime error "RuntimeException in Message-Mapping transformation".

I went to trace and checked up and then tested the mapping program with XML Source from payload Of Inbound Message.

Strange thing is I am not getting any error. Samething i tested for other msgs as well but received no errors.

After sometime, I tried to reprocess the error msg from sxmb_moni, but still I got the same error.

Finally again i retriggered the Idocs from source then all messages processed without any errors. I have not done anything in mapping.

if there is problem in mapping, it could have thrown the same error again.

wht could be the reason, why i got the errors even though there is no problem in mapping.

any help will be appreciated....

thanx,

kumar