You may want to enable the system to automatically generate a Vessel Code upon new vessel creation. You can do so by entering a custom expression as the value of configuration flag CFGAutoVesselCode.
To set it up with a running alphabetical and numerical order, enter [A-Z] for letters and [0-9] for numbers.
In the example below, newly created Vessel Codes will start with A000 and end with Z999.
You can also set a letter or number in the Vessel Code that will remain fixed. For example, Z9[0-9][0-9] will generate Vessel Codes between Z900 and Z999.