Hi Selvam,
Use this below code on ON_BEFORE_WA_CONTENT_CHANGE of your main Window.
DATA lr_child TYPE REF TO if_bsp_wd_view_group_context.
lr_child = me->view_group_context->get_dependant_vg_context( ).
IF lr_child->is_all_views_editable_set( ) EQ abap_false.
* Do not Raise Popup
EXIT.
ELSE.
CALL METHOD super->on_before_wa_content_change
EXPORTING
data_loss_handler = data_loss_handler.
ENDIF.
It will resolve your issue, let me know if more help is required.
Regards,
Sumeet