Function Module not working consistently

Hi,

In my requirement I had to use the FM EXTENDED_PROGRAM_CHECK, when I have passed the program name and trying to get the result set from Resultstat, the result is being copied with zero systax errors, but when I pass same program to SLIN tcode I am having three errors in the resultstat table when I degbuged the same Function Module, do I have to call any thign more before calling this function module.

Thanks and Regards,

V.