SQL Statement Works In sqlplus, Not Grid Ctl For User Defined Metric

Question

I'm trying these queries:
Query 1:
select '0', '0' from dual
union
SELECT
to_char(d.sid),
to_char(d.serial#)
FROM v$sql a,
dba_Users c,
v$session d
WHERE
c.Username = 'SYSADM'
AND (a.Elapsed_Time * 0.000001 > 5
OR a.Executions > 1000)
AND a.Executions > 0
AND c.User_Id = a.ParSing_User_Id
AND (Round(a.Elapsed_Time * 0.000001 / a.Executions)) > 10
AND a.last_active_time > (sysdate - 1)
and a.sql_id = d.sql_id
Query 2:
select 0, 0 from dual
union
SELECT
d.sid,
d.serial#
FROM v$sql a,
dba_Users c,
v$session d
WHERE
c.Username = 'SYSADM'
AND (a.Elapsed_Time * 0.000001 > 5
OR a.Executions > 1000)
AND a.Executions > 0
AND c.User_Id = a.ParSing_User_Id
AND (Round(a.Elapsed_Time * 0.000001 / a.Executions)) > 10
AND a.last_active_time > (sysdate - 1)
and a.sql_id = d.sql_id
As you can see, Query 1 is selecting character results, Query 2 is selecting numerical results. Both work from sqlplus on the host. Trying to run either of them in a user defined metric in Grid Control returns: ORA-00918: column ambiguously defined
1. Why is the error returned in Grid Control?
2. Is there a way to see exactly which column Grid Control has the issue with?

Answer 1

Never mind, I got it.