Change internet user in SNC

SNC Gurus:

I had created a business partner (person) in SNC, and created them as an internet user.  I then deleted that user (BUPA_DEL). I want to create a new user for the same SAP user, but I cannot assign that user name as an internet user... I get a message "Internet user XXXXXX is already assigned to user 999999", where 999999 is the user that I had previously deleted.

Is there any way to assign this SAP user as an internet user for a new business partner?

Thanks for your help!

Scott