When trying to process a table containing a field "Last_Name"

It looks like these two values are considered the same:
sass
saß *ASCII 223

The cube processing fails complaining about a duplicate key value.

Errors in the OLAP storage engine: The attribute key is a duplicate: Table:
dbo_PersonDimension, Column: Last_Name, Value: Saß.



is there a setting in analysis services that can treat these as two distinct
values (Sql Seems to handle this fine) or is this a bug in AS2k5?