You can set the invoice number format and sequence in BQE CORE by navigating to Settings > Billing & Invoices > Invoices. Under the Invoice Numbering section, you can define the Prefix, Last Invoice No., and Suffix. The invoice number consists of these three components, and CORE automatically increments the middle number by one from the value entered in the Last Invoice No. field.
CORE supports both numeric and alphanumeric invoice numbers. The Prefix and Suffix fields can include up to 15 characters each. Deleting an invoice does not reset or reduce the counter, but CORE will reuse that invoice number if it becomes available.
Example: If you fill Prefix with the string INV, Last Invoice No. with 0000 and Suffix with 2026, the resulting invoice number will be INV-0001-2026.