Max Function in @Prompt

Hi,
We have a week dimension in our Cal table. The user wants to use a condition where if he will enter week number (for eg: 13-2009) then data of that particular week should be displayed and if he will enter ' * ' then data of last week in the table will be displayed.
To fetch the last week we can use max(cal.week). But how to use it in prompt? Because when I am using max function then getting an error that group functions are not supported in prompt. Below is the prompt condition I am using:
CAL.WEEK IN (decode(@Prompt('Enter week (or * for last week)', 'A',, MONO,FREE),'*',(MAX(CAL.WEEK)),@Prompt('Enter week (or * for last week)', 'A',, MONO,FREE)))
I tried it by creating an object for MAX(CAL.WEEK) and then tried to use it in prompt, but since prompt doesnot support it, this object was not visible in the object list while creating the prompt.
Please help.
Thanks,
Kirti

The problem you are facing is that a condition containing a grouping function belongs in the having close, not in the where...
There is no way to create something in the universe that will be put in the having clause.
So what you need is to put it in as subselect, which can go in the where.
Try the predefined filter like this...
(CAL.WEEK = @Prompt('Enter week (or * for last week)', 'A',, MONO,FREE)
OR (@Prompt('Enter week (or * for last week)', 'A',, MONO,FREE)='*'
AND CAL.WEEK=(SELECT max(C2.WEEK) FROM CAL C2)))
Do not forget the brackets around the two conditions with OR
Good luck,
Marianne

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