In standard SAP the information of how many leading zeros are preceding a serial number can not be recorded due to the technical mechanism of preocessing serial numbers from the user (or other systems) to the database. Customers have long asked for that functionality which at first seems a small issue but the complexity is in the details. This whitepaper deals with the standard leading zeros functionality first introduced in DI 46B, goes into the technical background. Customers not on the DI or DIMP industry solution platform will also find a discussion on modifying their system as to record leading zeros.