Date Problem

Hello Experts

i have a problem entering date at the selection screen in BEx. For my user ID in "SU01" the date format is DD.MM.YY, whereas when i enter in this format in the BEx its not accepting. But when i give in MM.DD.YY its accepting with "/".

Ex when i give 01.11.2001 (Not accepting)

when i give 11.01.2001 (Not Accepting)

When i give 11/01/2001 (Accepting)..

Why is this happening how can i overcome this problem. Any hints pls..Thanks in advance.

Regards

Sri