function AfterPForm return boolean is
begin
  if :eno1 is not null and :eno2 is not null then
  	:lpe:= ' and a.eno between :eno1 and :eno2';
  	
  elsif (:eno1 = :eno2) then
  	:lpe:=' and a.eno = '|| :eno1;
  	
  elsif :eno1 is null and :eno2 is not null then
  	 :lpe:=' and a.eno <= '||:eno2;
  	 
  elsif :eno1 is not null and :eno2 is null then
  	 :lpe:=' and a.eno >= '||:eno1;
  	 
  elsif :eno1 is null and :eno2 is null then
  	message(' enter the values propoerly');
  	raise form_trigger_failure;
  	 
  else
  	 :lpe:=null;
  	
  end if;  	
  return (TRUE);
end;