When the database is modified by human error (usually referring to the Issucard database), the system will prompt this message when performing electricity sales operations on the user card. Speaking of this issue, I want to emphasize that users must not make arbitrary changes to the system database, otherwise it may cause similar errors. If our service personnel are organizing and analyzing the database, it is important to check whether the electricity purchase records of each user are completely accurate and whether the cumulative electricity purchase is accurate. If it is not accurate, the data can be adjusted accordingly.