1, printer setting problem, left positioning slider of stylus printer is too right; 2. There is a problem with the font setting of the billing system, which leads to the incomplete content of the printed invoice; Solution: If only one digit of the invoice number is missing, other contents are not missing (ciphertext area, tax amount, etc. ), you can set the printing position and font, and fill this number on the invoice, so that the invoice does not need to be invalid; Because there is no problem with the billing system, you can use it normally by adding this number; Void method: log in to Invoicing System-Invoice Management-Invoice Void, and click the corresponding invoice number to void. (Note: Only the original drawer logs in can it be invalidated. )