How to remove check mark programaticaly from me57 to save data

Dear All,

I am having one requirement that i want to uncheck the two fields i.e repos , webre,

erekz . i.e we want to remove 'X' how can we do it using either user_exit or any other way .

i have added code in user exit EXIT_SAPMM06E_007 but all in vain .

i have also tried in other user exit but still not working as

it brings back that value again .

LOOP AT tekpo.

tekpo-repos = ''.

tekpo-webre = ''.

tekpo-erekz = ''.

MODIFY tekpo TRANSPORTING repos erekz webre.

ENDLOOP.

we have condition to check i.e pr_type . if pr_type ='ZFOC' then uncheck value s that it can be stored in table . for me57 .

please give hint or solution , thanks in advance .

Regards

Deepak Dhamat .