yes neeza its right.
step i enter t-code = NACE
Step 2 : - select application eg EF / Purchase order
step 3: click on "output types" button on application tool bar
step 4: under "output types " tree click on processing routines
( table control will show you required form and program)
then palce the breakpoint and check it.
hope it solve your problem
with regards,
vikas