I have just recently built and tested Cerner Millenium in our Blood Bank although we have not go live yet. In all my testing the Cerner System did not allow uncrossmatched blood to be dispensed without going through an emergency override flag. Valid Application States for your system can be modified if necessary but in all my testing the computer required all units to be crossmatched first or you will get the override message. Sounds like something is not set correctly and your Cerner Analyst should be able to resolve this easily.