SUSR0001 cannot be worded

Hi experts,
when i worked for last company, i used Exit SUSR0001,Component: EXIT_SAPLSUSF_001 to check the terminal ID ,
but it cannot workd in my new company now.

i coded programes in SUSR0001-EXIT_SAPLSUSF_001-ZXUSRU01 as before,
i set break point in the user exit,
it couldnot  be called  when i  login system for my computer,

it can be worked  in the ides system,
but  it  cannot be worked in prd  or dev or qas system,

why?

(SAP ECC 6.0   gui730)

Thank you        

                                                                                                                                from china