Users created from MS SQL Server instead of ArcMap.

Hi everyone,


I am using an Enterprise Geodatabase implemented under MS SQL Server 2008.
Though, I have created my users using MS SQL Server instead of using the Esri ArcGIS tool 'Create Database User'.

Now, I am about to create versions for the database but I am not able to find any of the users within the owner selection list !
What am I missing here?



Technical references:
- MS SQL Server 2008 R2/SDE.
- ArcGIS 10.1- Advanced.


Please help !

Thank you.