How to register database plsql function in obiee

Hi,
I've a database plsql function which accepts two date arguments - StartDate and EndDate and return Integer.
I discoverer like we've Plsql function registration tool, where we import function and pass parameter values as arguments in report- how same can be done in Oracle BI Administration tool and BI Answers?
I tried to create logical column as
EVALUATE('YOUR_FUNCTION(%1, %2, %3, %4)' as varchar(20),@{p_1},@{p_2},@{p_3},@{p_4})
it is giving syntax error.
url: How to store OBIEE presentation level variable values in DB
Please help. It is really urgent.
Kind Regards.

Hi,
I created 2 session variables p_startym and p_endym of char datatype and called in function(name: RepInitDates). It looks like:
EVALUATE('INIT_DATES_MONID(%1, %2)' AS INTEGER , VALUEOF(NQ_SESSION."p_startym"), VALUEOF(NQ_SESSION."p_endym")).
Now I've presentation variables StartMonth and EndMonth in bi answers report, whose value i want to pass to p_startym and p_endym. What should be the syntax of Bi answers column? Please reply.
Thanks

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