Solution for Concurrent number of AOS' for this application exceeds the licensed number

1. Test of AOS instance is running and right now stopped. I checked event viewer of application and found error as follow:
        Concurrent number of AOS' for this application exceeds the licensed number.
    As I know, the status issued by axdat.udb which saved online user. Maybe sometimes it didn't update users info.
2.  Shut AOS of AX_Test
1)        Delete axdat.udb of AX_Test. I tried it and found this file counldn't be deleted. (Message is  this file is using by other another one)
2)       Check who is using axdat.udb file and found it locked by system process and process id is 0x00000004.
3. Shutdown AOS of Live instance. Delete aoi and axdat.udb file. All can be deleted. Run Ax_test client and will create aoi and axdat.udb file
4. start AOS of AX_Test and start AX_Test instance
AX_Test instance is running.
Root Cause: Sometimes we copy live environment to test environment. aoi and udb files also were copied. But udb file saved online users info.
Action: When we copy live to test we should delete aoi and udb file.