Custom fields added to BSEG not editable in FB03/FB02

Hi Experts,

I've added a couple of custom fields in BSEG through OXK3. The field is marked as changeable without any conditions in OB32.

The user wants to edit these fields in FB03/FB02 after positing an entry in FB70.

But the fields are not editable. I've gone through a lot of posts in SDN and haven't got any solutions so far for this problem for new custom fields added(It works for the fields already available through OB32 config though).

I tried to enhanced the screen 300 in program SAPMF05L through implicit enhancement point, but the enhancement implementation is not getting triggered. Not able to find any other enhancement options like user exit or BADI for the same as well.

Please let me know, if it's feasible to make the custom fields editable in FB02/FB03 somehow.

Thanks a lot in advance...

Regards,

Satyajit