New in 4.5.1 Multiple InstIDs are allowed per user and handled within a single installation of uAchieve Self-Service.
Multiple InstIDs per User
When defining the Institution Code property in Security area for group and user, keeping the InstCD value set to NULL will mean something different than explicitly setting it to blank or some other value. (Defining an InstCD for each new institution prevents setting to "Default College," if configured.)
Setting InstIDQ and InstID and then leaving InstCD set to NULL will create a drop-down option of all InstCDs configured in Collegesource.properties for CollegeSource.instcds= using the configured description for each contained within Collegesource.properties.
Setting InstIDQ, InstID, and InstCD to specific value, meaning InstCD is NOT NULL will not even look at InstCDs configured in Collegesource.properties for CollegeSource.instcds= and will only provide an option for the specified InstCD in drop-down and using the description for it from Institution Code property directly. (Resolving Andrew's comment on UACH-2449).
' * ' vs NULL