Creating Dynamic Report - facing error REP-498

Question

Hi guys,
Facing problem Creating Dynamic Reports.
Error : REP-498: Number of columns selected by the query is incompatible with report definition.
Could you please show me where do i have to changed my query to get rid of this error message?
Thanking you in advance.
--dynamic query
select a.yr_no
&columname_1
from authorized_utilization_s a,
tblservicecategory b, tblnetworkplanrptgroup c,tblreportgroup e
&wherecl_1
&groupby_1
union
select a.yr_no
&columname_2
from authorized_utilization_s a,
tblservicecategory b, tblnetworkplanrptgroup c,tblreportgroup e
&wherecl_2
&groupby_2
&orderby
------after parameter form function
FUNCTION afterpform
RETURN BOOLEAN
IS
BEGIN
IF :report_type = 'C' -- C represent Carrier Report
THEN
:columname_1 := ',a.qtr_no,b.rptservicecatid, sum(a.sum_svcschedulerate)/1000 planamount ';
:wherecl_1 := ' where e.reportgroupid = c.reportgroupid '
||' and e.reportgroupid NOT IN (180,188,191,203,206,227,228, '
||' 229,230,231,232,233,234,235,236,237,238,365,366,550,644,645)'
||' and e.reportgroupclassid = '|| :p_reportgroupid
||' and a.planid = c.planid '
||' and a.yr_no = '||:p_year
||' and a.qtr_no <= '|| :p_quarter
||' and rtrim(a.servicecatid) = rtrim(b.servicecatid) ' ;
:groupby_1 := ' group by a.yr_no,a.qtr_no,b.rptservicecatid ';
:columname_2 := ', a.qtr_no,b.rptservicecatid, sum(a.sum_svcschedulerate)/1000 planamount';
:wherecl_2 := ' where e.reportgroupid = c.reportgroupid '
||' and e.reportgroupid NOT IN (180,188,191,203,206,227,228, '
||' 229,230,231,232,233,234,235,236,237,238,365,366,550,644,645)'
||' and e.reportgroupclassid = '|| :p_reportgroupid
||' and a.planid = c.planid '
||' and a.yr_no = '||:p_year||' - 1 '
||' and a.qtr_no >= '||:p_quarter
||' and rtrim(a.servicecatid) = rtrim(b.servicecatid) ';
:groupby_2 :=' group by a.yr_no,a.qtr_no,b.rptservicecatid ';
:orderby :=' order by yr_no, qtr_no, rptservicecatid ' ;
ELSIF :report_type = 'Q'
THEN -- Q represent Quarter Report
-- second condition will be here for 'Q'
ELSIF :report_type = 'A'
THEN -- A represent Annual Report
--third condition will be here  for 'A'
ELSE
:tablename := '';
:wherecl := '';
END IF;
RETURN (TRUE);
END;
----final query for report type 'C' should looks like this and WHICH IS WORKING FINE FROM SQL*PLUS.
select a.yr_no
,a.qtr_no,b.rptservicecatid, sum(a.sum_svcschedulerate)/1000 planamount
from authorized_utilization_s a,
tblservicecategory b, tblnetworkplanrptgroup c,tblreportgroup e
where e.reportgroupid = c.reportgroupid
and e.reportgroupid NOT IN (180,188,191,203,206,227,228,
229,230,231,232,233,234,235,236,237,238,365,366,550,644,645)
and e.reportgroupclassid = :p_reportgroupid
and a.planid = c.planid
and a.yr_no = :p_year
and a.qtr_no <= :p_quarter
and rtrim(a.servicecatid) = rtrim(b.servicecatid)
group by a.yr_no,a.qtr_no,b.rptservicecatid
union
select a.yr_no
, a.qtr_no,b.rptservicecatid, sum(a.sum_svcschedulerate)/1000 planamount
from authorized_utilization_s a,
tblservicecategory b, tblnetworkplanrptgroup c,tblreportgroup e
where e.reportgroupid = c.reportgroupid
and e.reportgroupid NOT IN (180,188,191,203,206,227,228,
229,230,231,232,233,234,235,236,237,238,365,366,550,644,645)
and e.reportgroupclassid = :p_reportgroupid
and a.planid = c.planid
and a.yr_no = :p_year - 1
and a.qtr_no >= :p_quarter
and rtrim(a.servicecatid) = rtrim(b.servicecatid)
group by a.yr_no,a.qtr_no,b.rptservicecatid
order by yr_no, qtr_no, rptservicecatid ;

Answer 1

The problem is with initial values of your lexical parameters. They should be so that even before obtaining their desired values in the trigger, they would create syntactically correct SQL returning as many columns and of appropriate types, as you expect the final SQL to produce. You can not manipulate the number and types of columns using lexical parameters, just the real mapping to the table columns. The number, the type, and the order of selected columns should be defined by initial values of lexical parameters.