Date time characteristic converted in a string in Universe OLAP

Hi there,
We are facing to the following issue. Maybe one of you has been already facing to.
We have created a BO universe on top of BI queries (based on MDX) and we make WEBI reports.
We note when we update/refresh the OLAP structure, all characteristics (Number and date) are converted/considered as a character and string and we loose in that way the time information.
This is very ennoying when sorting on time dimensions as WEBI can only sort on Alphabetic order.
Indeed, we would like to display the last 13 month of a key figure as from the last month.
As the time characteristic is automatically converted by the Olap refresh structure in a string, we can't display the last 13 months in logical/natural/calendar order.
Ex: NOV 2007 | DEC 2007 | JAN 2008 | FEB 2008 ....DEC 2008
Any idea :
- why the 'Refresh structure' command automatically convert into a string?
- how to force him not to convert to string and keep the date information?
- order date as the logical/natural/calendar one?
Beforehand, thanks a lot

Hi Ingo,
I'm using 0CMonth or 0CALMONTH which are SAP characteristics.
Do you know how to sort data by date and not by string?
When we recuperate infoobejcts from BI queriies, all objects are string and all LOV are sorted by string which don't help us.
imagine we have JAN 1996, JAN 1997,... FEB 1996 etc etc.
A nightmare
Laurent

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Date time characteristic converted in a string in Universe OLAP

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