Debugging not possible in SM66 t-code

Dear All,

I created infinite loop in the program.

I executed the program in 2 ways:

1. Direct execute the program (SE38).

I can see the process in SM66.

I choose that record and click the debugging button, ABAP Debugger is come out and i can debug my code.

2. I call that program in background or from other system using RFC.

I Can see the process in SM66.

I choose that record and click the debugging button, it said ABAP debugger started.. but nothing come out and i can't debug my program.

Pls suggest why the 2nd way can't debug.

Best Regards,

Victor.