Number Range of SAP for Retail

Dear Gurus,

I am very much familiar with creating, adding group and removing number range in SAP ERP.

I am however bugged about how the number range of SAP for Retail works.

External number range is available for assignment

but on the "Maintain Intervals" i select on the drop down menu "Existing" and choose the external number (02), it does not have any activity.

am i missing something here?

Hope anyone can help me on this. Thanks.

Regards,

Ber