Date variable in a column formula

Hi
I am having trouble using date-values from a Dashboard Prompt in a column formula in Answers.
The situation:
I use a dashboard prompt to select a date, the selected date stored in a presentation variable ('production_end'). In an answers request, I would like to use the 'selected_date' value to filter values for one column:
FILTER("Measures new".Produced USING(Calender."Full Date" = @{production_end}{timestamp'2009-07-31 00:00:00'))
Error after prompt execution:
Error Codes: OPR4ONWY:U9IM8TAC:OI2DL65P:OI2DL65P
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 27002] Near <00>: Syntax error [nQSError: 26012] . (HY000)
SQL Issued: {call NQSGetQueryColumnInfo('SELECT FILTER("Measures new".Produced USING(Calender."Full Date" = 2010-07-14 00:00:00 FROM source_db')}
SQL Issued: SELECT FILTER("Measures new".Produced USING(Calender."Full Date" = 2010-07-14 00:00:00 FROM source_db
There is no problem using the production_end in a column filter to filter the whole request, the error only shows up whenever I try to use it in a column formula.
Hope you can help.
Thanks
Regards
Andy

Hi Kart,
I think I found the problem and the solution.
I use a dashboard prompt with a default value based on a repository variable ('today'). The prompt feeds a presentation variable ('prod_end').
In the answers request I use prod_end in the following column formula (I changed the request slightly compared to the ones we were discussing - the basic functionality of using the presentation variable is the same):
MONTH(timestamp'@{prod_end}')
That combination leads to the follow error when opening the dashboard for the first time:
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000]
[nQSError: 10058] A general error has occurred.
[nQSError: 46047] Datetime value TIMESTAMP '2010-07-15 00:00:00' from TIMESTAMP '2010-07-15 00:00:00' does not match the specified format. (HY000)
The first timestamp probably being the timestamp defined in my column formula, the second one (the one selecting from) probably being the repository variable definition.
Solution:
If I default the dashboard prompt using an sql statement to refer to the repository variable 'today' it works
Default prompt to:
SELECT Calender."Full Date" FROM OLS where Calender."Full Date" = VALUEOF("today")
Thanks for your help
Regards
Andy

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