This plugin is specific to AM123 but could be used as a base for similar operations. It is used for stocknumber computation.
If the user send an empty string, we return a simple incremented stocknumber. If a prefix is submited, we look for the highest stocknumber with this prefix, and return it incremented. In this case, a stocknumber has this form : "PREFIX 0009678570". - PREFIX is an upercase word - a space separator - 10 digits, with leading 0s if needed