Can call a function a few times in reports

Question

Hi
Please help me to solve this problem:
I have a function taking parameters and return a number, I tried
2 ways to call this function but get same error saying the
function may not be used in SQL:
1. the function is in a package, and I use the pl/sql query
(build from data model) to call it a few times by passing
different parameters, I get error when compile the query
2. the function is outside the package, and is called from
another function in the package a few times, get error when
compile the package body.
3. by the way is weekly typed ref cursor allowed in reports?
Below is part of my code:
case 1:
create or replace package perDiem AS
PRAGMA SERIALLY_REUSABLE;
TYPE curType IS REF CURSOR;
function diemSum (
party_id IN NUMBER,
partytype IN NUMBER,
fid IN NUMBER,
freeday_type IN VARCHAR2,
startdays IN NUMBER,
enddays IN NUMBER)
RETURN NUMBER;
END;
CREATE OR REPLACE PACKAGE BODY perDiem AS
PRAGMA SERIALLY_REUSABLE;
function diemSum (
party_id IN NUMBER,
partytype IN NUMBER,
fid IN NUMBER,
freeday_type IN VARCHAR2,
startdays IN NUMBER,
enddays IN NUMBER)
RETURN NUMBER IS
pdSum NUMBER(10);
BEGIN
IF partytype = 1 THEN
IF freeday_type = 'gateout' THEN
SELECT COUNT(*) INTO pdsum
FROM equipment e,
equipmenttrip et,
facilitysegment s
WHERE s.facilityid =fid
AND et.lastfreeday between startdays AND enddays
AND et.carrierpartyid =party_id;
ELSIF freeday_type = 'strip' THEN
SELECT COUNT(*) INTO pdsum
FROM equipment e,
END IF;
ELSIF partytype = 3 THEN
IF freeday_type = 'gateout' THEN
SELECT COUNT(*) INTO pdsum
FROM ...
ELSIF freeday_type = 'strip' THEN
SELECT COUNT(*) INTO pdsum
FROM facility f,
END IF;
END IF;
RETURN pdsum;
END diemSum;
END;
/////////// pl/sql query//////////////
function diemDet return perDiem.curType is
sum_cv perDiem.curType;
     party_code VARCHAR2(20);     
          freeday_type VARCHAR2(20);
begin
party_code := :partycode;
          freeday_type := :freeday;
          OPEN sum_cv FOR SELECT      f.facilitycode,
               perDiem.diemSum(p.partyid,
p.partytypeid, f.facilityid, freeday_type, 1, 4 ) as days1,
          perDiem.diemSum(p.partyid, p.partytypeid,
f.facilityid, freeday_type, 5, 10 ) as days2,
          perDiem.diemSum(p.partyid, p.partytypeid,
f.facilityid, freeday_type, 11, 10000 ) as days3
          FROM equipmenttrip et,
               facility f,
               facilitysegment s,
               party p
     WHERE f.facilityid = s.facilityid
          AND p.partycode = party_code ;
     RETURN sum_cv ;
end;
case 2 *** diemSum is a seperate function from package
create or replace package perDiem AS
PRAGMA SERIALLY_REUSABLE;
TYPE curType IS REF CURSOR;
function diemDet (
party_code IN VARCHAR2,
freeday_type IN VARCHAR2)
RETURN curType;
END;
CREATE OR REPLACE PACKAGE BODY perDiem AS
PRAGMA SERIALLY_REUSABLE;
function diemDet (
party_code IN VARCHAR2,
freeday_type IN VARCHAR2)
RETURN curType IS
sum_cv curType;
BEGIN
OPEN sum_cv FOR SELECT f.facilitycode,
diemSum(p.partyid, p.partytypeid, f.facilityid, freeday_type, 1,
4 ) as days1,
diemSum(p.partyid, p.partytypeid, f.facilityid, freeday_type, 5,
10 ) as days2,
diemSum(p.partyid, p.partytypeid, f.facilityid, freeday_type,
11, 10000 ) as days3
FROM equipmenttrip et,
facility f,
facilitysegment s,
party p
WHERE ...
RETURN sum_cv ;
END diemDet;
END;

Answer 1

My bet would be that the function doesn't promise not to update
the database. Therefor it can't be called from a select statment.
To overcome this you need to define a pragma. I don't remember
its exact name but I think it is restricted_reference.