Help: calling report from report in report 9i

Question

Background:
1. Report Builder 9i and the outputs are PDF files;
2. Report A and Report B both have two identical parameters: P1 and P2;
3. Calling Report A through FORM using web.show_document() with paraform=YES,
Help:
If Report B can be called from Report A, the parameters P1, P2 passed through calling report A, the user then needs not to enter twice P1 and P2 using web.show_document().
Wishful way of thinking:
The Calling FORM refered here is the one that provides all buttons for more than 20 reports and that is the reason of using parameter form. Consequently, I am looking for ways of making:
Calling FORM -> REPORT A -> REPORT B
where both Report A and B have same parameters, calling FORM calls REPORT A using REPORT A parameter form and hoping that REPORT A can call REPORT B with these parameters.
Any help are greatly appreciated.
Jimmy

Answer 1

I tried something in Before Report trigger like:
function BeforeReport return boolean is
begin
srw.run_report('batch=yes sf1='||:pf1 || 'sf2='||:pf2 || ' report=REPORT_B destype=cache desformat=pdf');
return (TRUE);
end;
An error raised as: REP-1428: 'beforereport': Error while running SRW.RUN_REPORT.
Here sf1, pf1 and sf2, pf2 and two pairs of identical parameters.
Any suggestions?