substitution -debug prob

hi masters,

in TCODE OBBH i have created substitution

the EXIT IS = U001.

in the substitution i have selected the U001.

BUT it does not take to my routine.

i have writen tHE ROUTINE Like this.

form U001.

endform.

but once i give the EXIT NAME in the SUBSTITUTION It does not move anywhere.

but when i trying to select the EXIT it goes DEBUGGER and not after my selction of EXIT - U001.

CAN YOU PLEASE TELL WHAT I NEED TO DO NOW.

thank you,

pasala.