How do i call a :cp_ or a :cf in a query in reports builder?

Question

Hi, i got a report.
i included a function in 1 of my queries in reports builder but the report is running very long now.
so i tryed to put the function in that query in a :cf (formula column) and call the :cf in my query but its not picking up the value.
am i missing something?
or is there another way?
please help asap.
thanks....

Answer 1

in my data model in reports builder :
i have a main query with about 5 other queries.
in one of the 5 queries i am getting tax information, which contains unions, i have just pasted one of the unions.
If you look in this query (in bold) you will see i tried inderting the database function, but it runs too slow.
then i tried to insert the same function in a cf, and then tried to call the cf in my query, just to get the value (tax_start_date).
the cf doesn't affect the performance and i can see the value in the xml but cant seem to call the value in my query.
SELECT distinct decode(pbv.balance_name,'Asset Purchased at Reduced Value', 'General Fringe Benefit',pbv.balance_name) balance_name,
'(' ||'YTD'||')',
decode(pbv.effective_date,:effective_date,pbv.effective_date,:effective_date)effective_date,
pbv.assignment_id,
pbv.ASSIGNMENT_ACTION_ID,
pbv.PAYROLL_ACTION_ID,
sum(pbv.VALUE) value,
FROM pay_balance_values_africa_v pbv
WHERE (
pbv.balance_name = 'Bonus Provision'
OR pbv.balance_name = 'Non Taxable Subsistence'
OR pbv.balance_name = 'Taxable Subsistence RFI'
OR pbv.balance_name = 'Taxable Subsistence NRFI')
AND pbv.database_item_suffix in ('_ASG_TYTD')
and pbv.VALUE <> '0'
and pbv.effective_date = (select max(pbva.effective_date) from pay_balance_values_africa_v pbva--, xxfrgpay_legis_tax_year_v lty
WHERE --pbva.BUSINESS_GROUP_ID = lty.BUSINESS_GROUP_ID
pbva.assignment_id = :assignment_id
and pbva.balance_name = pbv.balance_name
and pbva.database_item_suffix in ('_ASG_TYTD')
--  and  pbva.effective_date between '01-MAR-10' and :effective_date-- '31-DEC-2010'
and  pbva.effective_date between (apps.xxfrg_africa_tax_reg.get_tax_dates(0, null, null, null, pbva.effective_date) ) and :effective_date
--and  pbva.effective_date between  :cf_tax_start_date and :effective_date*                         )
and pbv.assignment_id = :assignment_id
and pbv.business_group_id in (81,84,86,88)
group by pbv.balance_name,pbv.effective_date,pbv.assignment_id,pbv.ASSIGNMENT_ACTION_ID, pbv.PAYROLL_ACTION_ID
ORDER BY 2