Error in PL/SQL for Calculated Item

Question

I have calculated items on a page, one called :P7_AMOUNT_GRANT which has the code below:
DECLARE
     v_amount_grant     varchar2(30);
BEGIN
     SELECT APPROVED_COST * (PERCENT_GRANT / 100)     
INTO v_amount_grant
     FROM HIG_GRANTS
     WHERE ID = :P7_ID;
RETURN TO_CHAR(v_amount_grant, 'FML999G999G999G999G990D00');
END;
This code above works perfectly
and another item which is called :P7_GRANT_PAYABLE which has the source code below, this is not working, as I am getting a number to character error. Can anyone help?
I did have this working, but accidently overtyped the code, and lost the working pl/sql.
DECLARE
v_getval varchar2(30);
v_reg_fee varchar2(30);
BEGIN
SELECT LESS_REG_FEE
INTO v_reg_fee
FROM HIG_GRANTS
WHERE ID = :P7_ID;
IF v_reg_fee is null THEN
v_getval := TO_NUMBER(:P7_AMOUNT_GRANT);
ELSE
v_getval := TO_NUMBER(:P7_AMOUNT_GRANT) - TO_NUMBER(:P7_LESS_REG_FEE);
END IF;
RETURN TO_CHAR(v_getval, 'FML999G999G999G999G990D00');
END;
I know it will no doubt be a silly little thing, but it is driving me crazy!
Thanks

Answer 1

DECLARE
v_getval varchar2(30);
v_reg_fee varchar2(30);
BEGIN
SELECT LESS_REG_FEE
INTO v_reg_fee
FROM HIG_GRANTS
WHERE ID = :P7_ID;
IF v_reg_fee is null THENBelow, you're trying to assign a number to your varchar2 variable, which won't work. You need a number variable to hold the := to_number() assignment.
v_getval := TO_NUMBER(:P7_AMOUNT_GRANT);
ELSE
v_getval := TO_NUMBER(:P7_AMOUNT_GRANT) -
TO_NUMBER(:P7_LESS_REG_FEE);
ND IF;
RETURN TO_CHAR(v_getval,
'FML999G999G999G999G990D00');
END;
I know it will no doubt be a silly little thing, but
it is driving me crazy!
ThanksEarl