Oracle Forms

Hi,
I have a form with multiple tabs. In when_tab_page_changed trigger I have following code :

	IF some_condition and cur_tab = 'OPTIONS'  THEN
		create_parameter_duration_list;
	END IF;

the code in procedure create_parameter_duration_list is as follows

PROCEDURE create_parameter_duration_list IS
BEGIN
if get_block_property('report_request',status) <> 'NEW' then
       GO_BLOCK ('REPORT_REQUEST');   ---- Block is in TAB_1
       FIRST_RECORD;
       loop
           do_something.....
          IF :SYSTEM.LAST_RECORD = 'TRUE' THEN
	EXIT;
          ELSE
	NEXT_RECORD;
          END IF;
      END LOOP;
end if;

END;

The problem I am facing is, If a user enters some value in the report_request block (TAB_1) and goes to 'OPTIONS' tab , the form works fine....but if the user goes back to the tab_1 and clears the value in report _request block and then goes to OPTIONS tab then I get the frm-40106 error (No navigable items in destination block)