Request variable in Answers prompt

I am on OBIEE 11.1.1.5 and have created a session variable which is set to 'Enable any user to set the value'. Then default for this varaible is set to CURRENT_DATE. I have created a logical column to calculate Length of Service based on this variable like
cast(Floor( (TIMESTAMPDIFF( SQL_TSI_MONTH , "Core"."Fact - Active - Period of Service"."Hire Date" ,VALUEOF(NQ.SESSION."Test")))/12) as char)||' year(s) '||cast(Mod((TIMESTAMPDIFF( SQL_TSI_MONTH , "Core"."Fact - Active - Period of Service"."Hire Date" ,VALUEOF(NQ.SESSION."Test"))),12) as char)||' month(s)'
Now I create a answers request and put this logical column on it. What should be the prompt so that the Length of Service gets calculated based on the iput provided by the user?

I am following http://everythingoracle.com/obieerv.htm to move forward.
I created a variable prompt abc with date as data type and then in Advanced tab under Advanced SQL Cluses in Prefix I typed: SET VARIABLE Test='{abc}';
This just puts '{abc}' in the formula. And if I try SET VARIABLE Test={abc}; then it throws syntax error i Advanced tab.
What am I doing wrong?
Edited by: user12301184 on Aug 26, 2011 6:38 AM

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http://download.oracle.com/docs/cd/E10415_01/doc/bi.1013/b31767.pdf page 98.
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