Secuencia para facturas separada de la secuencia de asientos

This module changes how invoice numbers are assigned in Spanish companies. Instead of taking the number from the journal entry, each invoice gets its own number from a dedicated sequence configured on the journal.

On the journal form (Accounting > Configuration > Journals), for sales and purchase journals you now see two extra fields: 'Invoice sequence' and 'Refund sequence'. These let you choose which numbering series is used for normal invoices and which for refunds (credit notes).

When an invoice is validated, the module automatically assigns the next number from the appropriate sequence, based on the invoice date, and stores it both as the invoice number and as the invoice reference. The invoice reference is also added to the related journal entry, so it can be seen during bank reconciliation.

When a Spanish chart of accounts is installed, the module automatically creates a shared journal entry sequence and separate invoice and refund sequences for each sales and purchase journal. New journals created later reuse the same journal entry sequence, and changing a journal code does not silently change the sequence prefix.

It also checks that the company of the chosen sequence matches the company of the journal, and prevents deleting invoices that use a dedicated invoice sequence by clearing their move name first.