Generally, this situation is unlikely to occur. If it does, the reasons may be:

1. There may be a discrepancy between the number you declared and the number approved by the tax bureau. Whether there are refunds or invalid invoices, the calculation caliber of the tax bureau is inconsistent with yours. You need to communicate with the tax bureau

2. It is also possible that there is a problem with the invoicing machine and the machine maintenance personnel need to check it