Calling SQL Server function in ODI

Hi All,
In the Target data store in the interface I have a column called COUNT_BY_CERTDATE column and in the mapping I have teh following syntax, which does not work.
SUM(CASE WHEN ((dbo.getcertdate(person_id,getdate()) >= current_timestamp) THEN 1 ELSE 0 END). The 'getcertdate' is a SQL Server function which returns a date.
I am getting a "Expression is not valid for this DBMS error" with the details as getcertdate is not a recognized built in function name. Please help on fixing this issue.
Thanks for your time and help.

Its defined on the source.
I am getting the following error, when I execute it.
ODI-1228: Task Load_Fact_Table1 (Integration) fails on the target MICROSOFT_SQL_SERVER connection SQLSERVER_USAASC.
Caused By: java.sql.SQLException: [FMWGEN][SQLServer JDBC Driver][SQLServer]Cannot find either column "main" or the user-defined function or aggregate "main.dbo.getCertDate", or the name is ambiguous.
Edited by: ssk1974 on Dec 20, 2012 6:30 AM

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Call SQL Server function through the gateway

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ERROR at line 1:
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2 val varchar2(100);
3 c integer;
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SQL_Latin1_General_CP1_CI_AS
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15
- Klaus

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http://social.msdn.microsoft.com/Forums/sqlserver/en-US/62a6556e-6655-4d19-9112-1788cf7bbcfc/wrk-file-in-logshipping-2005
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