unable to set breakpoint at statement CALL CUSTOMER-FUNCTION

HI,

I am try to set break point at CALL CUSTOMER-FUNCTION , to know the exit name for VA01 screen.

But even after setting the break point it is not stopping . can anyone tell me wht could be the problem.

i am setting like this ,

1) entering '/h'

2) from menu BREAKPOINTS->BREAKPOINT AT -> STATMENT

3) Enter.

4)f8

mineis Ecc 5.0 version.

please let me know