MIGO - user exit - POST

I have added code in the user exit MB_CF001 for the transcation code MIGO.

I put a break-point in it (hard coded),

I have activated in SMOD and CMOD also.

But when i run MIGO and POST (click on post button on application tool bar) it is not posting, while clicking on SAVE also it is not stopping.

Please tell me when the user exit will be encountered.

regards,

Prabhu.

Points assured.