Function Previous() does not retrieve good values

Hello Forum,
I'm using BO XIR2, Desktop Intelligence.
I'm displaying some quantities and turnover by month and I try to compute the % of increase/decrease between a month and the previous month. The report looks like that :
.........................Jan......%.......Feb........%.......March........%.......Apr
Quantity...............10..................15........50.............16........-6
Turnover............. 3.5....................4........14............3.9.....-2.5
I use fonction Previous to compute the % of discrepancy. For example, for quantity : % = (qty-Previous(qty))/Previsous(qty)
My problem : for some months, the Previous(function) does not retrieve the value of the previous month. It usually adds 1 or 2 to the value of the previous month.
Does anyone face the same problem ?
Best Regards

Hi,
try sorting your data in the SQL query based using the month number (ascending).
Regards,
Stratos

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Function does not return a value

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Hi ,
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E.g:
CREATE OR REPLACE FUNCTION TEST_DNAME
(p_empno IN NUMBER,p_deptno IN NUMBER)
RETURN VARCHAR2
IS
v_dname varchar2(50);
v_empno varchar2(50);
V_err varchar2(100);
v_cnt NUMBER := 0;
BEGIN
SELECT d.dname,e.empno
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WHERE e.empno=p_empno
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Sql Statement
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AND IF I enter a valid combination of parameter then I get the below error :
e.g:
SQL> SELECT TEST_DNAME(7369,20) FROM dual
2 .
SQL> /
SELECT TEST_DNAME(7369,20) FROM dual
ERROR at line 1:
ORA-06503: PL/SQL: Function returned without value
ORA-06512: at "SCOTT.TEST_DNAME", line 24
Where I am missing .
Thanks,

Format you code properly and look at it:
CREATE OR REPLACE
   FUNCTION TEST_DNAME(
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                       p_deptno IN NUMBER
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SY.

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Function Previous() does not retrieve good values

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