If you are having problems with people getting into OASIS and are receiving the popup message license number exceeding, then you will want to check the number of licenses you have currently installed.
To Check the information login to OASIS as an admin user and go to the Configuration Section.
Click on Software. Under Global Preferences, click on Licenses. The license viewer window will popup, look for the entry name of users. The value nubmer next to users is the number of seats that you have for OASIS. (see screen shot below)
If you feel that the number is incorrect please Contact OASIS Support.