F11 and ctrl+F11 not retrieving the last search

Question

I have created a form in oracle 10g.where F11 is enter-query and ctrl+F11 is execute-query.
Every time its working fine.When ever I give any input and press ctrl+F11 its being executed and then if I press F11 then going to enter-query mode.
But my problem is :-
If I open the form and without giving any i/p I press F11 and ctrl+F11 consecutively then it should show the last search.While in my form its just asking to select a new search/query.

Answer 1

Thanks a lot for the suggestion..
First  queried in the form,then without closing that in the same session I pressed F11 twice.
But I am getting an error-
FRM-41009: Function key not allowed. Press %s for list of valid keys.
I have checked function key mapping its alright-F11:= enter query.
I have given some messages to check the mode of the form at different position.
I have key-entqry:-
begin
    if :system.mode != 'ENTER-QUERY'  then
       go_item('blk1.leverandoer_kode');
    end if;
message(:system.mode);pause;   -------------------> mode= NORMAL
  clear_form(no_validate);
  go_block('BLK1');
message(:system.mode);pause; -------> mode= NORMAL
                     -------------> Here it prompting to enter F11 or cntrl+F11 again; Pressing F11
                     --------------> Here the error is coming (frm-41009) twice.
  enter_query;
  message('after enter');pause;                          -----------> Then its shoing this message
message(:system.mode);pause;                       -----> mode= Enter-query
   end;
Please help me out.