Hi Arti Verma,
try this go to main window class there is a method SET_VIEW_GROUP_CONTEXT redefine this method write this code.
if me->view_group_context is NOT BOUND and
iv_first_time = abap_true.
if iv_parent_context is INITIAL.
CREATE OBJECT view_group_context
type cl_bsp_wd_view_group_context.
ENDIF.
ENDIF.
and go to your form view class do_prepare_out write this logic.
me->view_group_context->set_all_editable( ).
then go to your field get_i_method.
rv_disabled = 'FALSE'.
try this will work.
Thanks & Regards,
Srinivask.