Page level column may not be referenced

Question

I have a report that has a data link connecting two queries. The child layout will not show up if the link is not equal but the parent layout does. What i need to do is show neither layout if the parent and child are not equal. I tried creating a summary column at the report level and set it to reset at page level. I set it up to get the count of the 'item' in the child layout. Each item has its own page and and if the count = 0 then return(FALSE).
begin
if :cs_1 = 0 then
return(false);
else
return (TRUE);
end if;
end;
I get the following error
REP-1275 Page Level column cs_1 may not be referenced forom format trigger 'R_Item'.
I have tried creating a frame around the entire layout with the same format trigger but it returns the same error.
Any suggestions on how to resolve this probelm?

Answer 1

Linking is different from creating one query with a foreign key relation. Its' actually two independent queries.
If you want your kind of behaviour, the easiest way is to create just one query with two groups. Like:
select d.dname, e.ename
from emp e, dept d
where e.deptno = d.deptno
This will never show deptno 40 (if you have the default SCOTT data installed).
Since you already have two queries, you can put the summary column in the parent group, not on report level.