HELP with Oracle Reports 6i - user parameters .....

Question

Hi, i have made a form with button in Oracle Forms 6i.
When i press the button it fires trigger (when-button-pressed) where i declared and made parameter (:p_dep_no) which i want to sedn to report and later query report with this (:p_dep_no) ...
In Oracle report i made this parameter under user parameter and made my SQL statemet where i included in where clause my parameter (:p_dep_no) .
When i run oracle forms and press this button i get popup screen which asks me to enter this user parameter....
My question is - how i can make it all automaticly ... that i didn't need to write (:p_dep_no) manualy, but report could get this parameter from oracle forms and then show me only queried report ....
Plz help

Answer 1

i have similar code already wroten to button, but when i push button and report is opening, i get popup report parameter form screen and it asks me to write parameter value....
here i have (when-button-pressed) code :
declare
     pl_id ParamList;
begin
     pl_id := Get_Parameter_List('tmpdata');
     IF NOT Id_Null(pl_id) THEN
           Destroy_Parameter_List( pl_id );
     END IF; 
     pl_id := Create_Parameter_List('tmpdata');
     Add_Parameter(pl_id,'par_report',TEXT_PARAMETER, :registry_id);
     RUN_PRODUCT(REPORTS, 'C:\Oracle\DS6i\BIN\reg_atskaite_vienam.rdf',SYNCHRONOUS,runtime,FILESYSTEM,'pl_id',null);
end;