Prob with formula column plz help!!!!!

Question

hi
iam working on a finance report
where there is a need for opening balance and closing balance colum, i have designed the column the out put comes but the prob is after displaying the opening balance closing balance it again displays a nil opening balance and closing balance for all the values given as input
its liek this
opening balance=0.00
closing balance=0.00
i have attached the formula which i have written pls help me wats wrong in the formula column
for opening balance
function CF_total_dr1Formula return Number is
begin
IF :cf_total_dr - :cf_total_cr > 0 THEN
RETURN(:cf_total_dr - :cf_total_cr);
ELSE
RETURN( 0 );
END IF;
end;
similarly for closing balance too

Answer 1

cf_total_dr is again calculated using a formula.. similarly cf_total_dr
i have specified the formula below, again this debit balance is a formula column
function CF_total_drFormula return Number is
v_bal NUMBER;
BEGIN
v_bal := debit_balance(:p_from_date);
RETURN(v_bal);
END;