Enable standard fields after error message

Hi All,

I have to enable the standard fields in ME11 after throwing an error message, i tried using suceess message display it like error. but its not working.

And the field which i want to enable is different, because i have implemented the code on another field. So how should i enable all the fields or specfic one field after error message. even i tried set cursor but its not working..

please help me out..

thanks in advance

Rahul