BDC Session method & GUI_upload

Hi,

I am using GUI_UPLOAD to get the tab delimited file into intenal table and using Session method,

Please tell me

1. How to upload the file which has comma seprator (Using GUI_UPLOAD)

for ex my file record looks 1000,test,nothing

2. I want to execute the session via RSBDCSUB and collect the error, Please tell me how to do it.

Regards,

Prabhu