Hi,

If no invoices have been posted yet, you can go to Accounting → Configuration → Sequences & Identifiers → Sequences (Developer Mode may be required), locate the customer invoice sequence, and update the Next Number to the value that matches your current accounting system.

If invoices have already been posted, Odoo may prevent changes to preserve accounting integrity, especially when using localization modules that enforce legal numbering requirements. In that case, you can usually set the next sequence number by editing the most recent draft invoice's number or adjusting the sequence configuration, depending on your localization and country-specific regulations.

When migrating from another system, the recommended approach is to configure the sequence before posting new invoices so that Odoo continues numbering seamlessly from the last invoice number used in your previous accounting software.

If you let us know your Odoo version and country/localization, we can provide more specific guidance, as some localizations impose restrictions on changing invoice sequences after documents have been posted.

Reference:

* https://www.youtube.com/watch?v=4DovbBdVkjI

* https://www.cybrosys.com/odoo/odoo-books/odoo-17-accounting/settings/sequence-number-modification-operations/

* https://www.odoo.com/documentation/19.0/applications/finance/accounting/customer_invoices/sequence.html#accounting-invoice-resequencing

Hope it helps

Hello,

Yes, this is possible in Odoo. Invoice numbering is controlled through the sequence configuration, and you can adjust the next number so it continues from your current accounting sequence instead of starting from a new one.

The exact steps may vary depending on your Odoo version and localization settings, but Odoo supports maintaining continuity with your existing invoice numbering during a migration.

Hope this works for you! If you need any help implementing this or want a more optimized approach, feel free to reach out for further discussion.

Regards,

Zehntech Technologies Inc.

santosh.sekwadia@zehntech.com

Para cambiar la numeración de facturas en Odoo 19:

Opción 1 - Editar en la primera factura (más simple):

1. Crea una nueva factura (sin confirmar)
2. Haz clic en el número de borrador mostrado arriba
3. Odoo permite editar el número manualmente la primera vez
4. Escribe el número correcto - la secuencia seguirá desde ahí

Opción 2 - Ajustar la secuencia (modo desarrollador):

1. Activa el modo desarrollador: Ajustes → Activar modo desarrollador
2. Ve a Ajustes → Técnico → Secuencias e Identificadores → Secuencias
3. Busca la secuencia del diario (ej: "Facturas de cliente")
4. Cambia el campo "Próximo Número" al valor requerido

El formato estándar de Odoo es PREFIJO/AÑO/NÚMERO (ej: INV/2025/00050). Si tu contabilidad usa otro formato, el prefijo se puede cambiar en la configuración del diario.