Italian Localization - Ricevute e ordini di vendita

This module links Italian receipt management with sales orders. On a sales order form, inside the payment information group, a new checkbox called corrispettivi appears.

• The checkbox is filled automatically: when you choose a customer, it takes the value from that customer's receipt setting; when you change the fiscal position, it takes the value from that fiscal position.
• When the sales order is invoiced, the generated invoice is sent to the receipts journal if the flag is set. If the flag is not set but the invoice would otherwise land in a receipts journal, the module redirects it to a normal, non-receipt sales journal.
• The same rule applies when you use the 'Invoice' advance payment wizard from a sales order: the created invoice is moved to the receipts journal when the order is flagged.

It touches the sales order (sale.order), the advance payment invoice wizard (sale.advance.payment.inv) and the accounting journal selection. No new menus or reports are added; the only visible change is the checkbox on the sales order screen.