WHEN-NEW-FORM-INSTANCE trigger in oracle forms

WHEN-NEW-FORM-INSTANCE trigger will work when you are opening form this will fetch all records available in your table and fetch into your block.

go_block('XXCAD_SR_REFUND_NOTIFICATIONS');
 if :XXCAD_SR_REFUND_NOTIFICATIONS.task_status = 'Open'
  then
  do_key('execute_query');
   else
  fnd_message.set_string ('There is no Open SRs in your Bin');
  fnd_message.show;
 end if;