Content is not allowed in prolog

Dear PI Experts,

I have encountered an error which says that "Content is not allowed in prolog" when checking the payload. Same configuration and settings (except for the file extension of course) used for xml file and it worked. I tried searching the web and found similar one but still the issue persists. I double checked my interface pattern and it is already Stateless (XI30 - Compatible) which is attached below. The blog that i found is also indicated below.

http://scn.sap.com/community/pi-and-soa-middleware/blog/2012/08/16/the-mystery-of-content-is-not-allowed-in-prolog

We are using PI 7.40 and the file that we are converting is in CSV and the target is WPUTAB (an iDoc).

Can somebody please share your experience on this one? Thanks much!

Kind regards,

Mark

Message was edited by: Mark Alvin Arca