Chart Series Query SQL

Question

Can anybody explain why a Line chart comprising of more than one Chart Series does not work when building the SQL constructed in PL/SQL ?
The second series is identical apart from the snapshot_ids.
I need to construct like this due to another problem with database links.
I''ve tried to trace this but nothing much is produced, maybe because of the SVG plug-in?
DECLARE q varchar2(1000);
BEGIN
q:='SELECT Snap_Time, Snap_TimeXX, Value
FROM (
SELECT TO_CHAR(S2.SNAP_TIME,''D'') Snap_Time,
TO_CHAR(S2.SNAP_TIME,''D'') Snap_TimeXX,
SUM(S.value) Value
FROM STATS$SYSSTAT S,
STATS$SNAPSHOT S2
WHERE S.SNAP_ID=S2.SNAP_ID
AND S.SNAP_ID between 832 and 859
AND S.INSTANCE_NUMBER=1
AND S.NAME=''execute count''
group by TO_CHAR(S2.SNAP_TIME,''D''))';
RETURN q;
END;

Answer 1

Yes it was that problem, but I still have an issue:
How do I set the Flash Chart to use a PL/SQL function in the first place ?
When I try to enter:
"return package.function;" in the Create Region Wizard, I get the following error:
Failed to parse SQL query:
return EXPERT.getFullListSQLByNC
ORA-00900: invalid SQL statement
Certain queries can only be executed when running your application, if your query appears syntactically correct, you can save your query without validation (see options below query source).