As part of the VAT Expert module, the Invoicing Settings section is designed for VAT experts using the VAT4U technology to serve clients and issue invoices. This area allows you to customize your invoice number format and, if applicable, the order number format.

Customizing Invoice and Order Number Formats

You can define the format for your invoice and order numbers using specific placeholders:

• Invoice Number Format: To create a custom invoice number format, include the placeholder {S}, which represents the sequence number of the invoice. For example, if you set the format as INVOICE#{S}, it will generate an invoice number like INVOICE#43, where 43 is the current sequence number.
• Year Reference: You can also include a year reference in your invoice numbers using the {YEAR} placeholder. For example, using the format INVOICE-{YEAR}-{S} will produce an invoice number like INVOICE-2024-43, indicating the year alongside the sequence number.
• Order Number Format: If your invoicing includes order numbers, you can set a similar format for them using the same placeholders. 

After you have configured the desired formats for both invoice and order numbers, be sure to click on "Save invoicing data" to apply your changes.