Chart Query and Failed to parse SQL query

Hi,
first of all, this is not a question. It is a reminder for me and maybe for someone with the same problem.
I just fell over this for the 123124 time.
I have a 3D Chart Query
select sum(order_ok) value,
      count(*) maximum_value
from      v_dialer_campaign
where campaign_uuid = :P300_CAMPAIGN_IDSaving fails with
"1 error has occurred Failed to parse SQL query!" ...
Saving the query without validation works, but does not show any result in the chart.
v_dialer_campaign is a view selecting from a view in a mssql db over database link and HS.
running the select in sqlplus or toad works.
Without any trace on freetds/unixodb/hs side, i would have not found the following line:
[FreeTDS][SQL Server]The data types nvarchar and text are incompatible in the equal to operator.[FreeTDS][SQL Server]Statement(s) could not be prepared.
Solution:
with q as (select :P300_CAMPAIGN_ID val from dual)
select     sum(order_ok) value,
     count(*) maximum_value
from     v_dialer_campaign
where     campaign_uuid in ( select val from q)Maybe the error output when validating the query should be included in the APEX error message.
Same solution applies for dynamic LOV's reading from HS using a where clause.

I tried your first query on Apex 3.2 and it created a nice dial chart.
Is there any ORA-xxxxx error along with the "failed to parse SQL query" message? Did you double check column & table name spelling?
P.S. The second query is invalid (a superfluous comma after the second column).

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I recreated the problem using page 1 of the Sample Application (app 15027).
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http://apex.oracle.com/pls/otn/f?p=31517:1
------------------------------------------------------------------------------

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