Inter Company Invoices Sale

This module extends the invoice screen (account.move) with one extra read-only field called "Source Invoice Delivery Address".

• The field is automatically filled from the delivery address of the related source invoice (auto_invoice_id.partner_shipping_id), so no manual entry is needed.
• It appears on the standard invoice form, right after the existing "Source Invoice" field, so users can compare the delivery address of the original document with the current one.
• The value is stored and read-only, meaning it is a snapshot of the source invoice's shipping address and cannot be edited by users.
• It works together with the inter-company invoicing and sales modules, which create the counterpart invoice automatically.

In practice, when an inter-company invoice is generated from a sale, the delivery address used on the original sale is visible on the generated invoice. This helps accountants and sales staff verify that the correct shipping address was carried over between companies. The module does not add menus, buttons, reports, checks, or scheduled actions; it only adds this informational field and its placement on the invoice form.