tmp

l10n_it_delivery_note/models/sale_order.py

@@ -99,6 +99,18 @@ def _assign_delivery_notes_invoices(self, invoice_ids):
                     lambda l: l.delivery_note_id in delivery_note_ids
                 )
 
+            invoiced_dn_lines = (
+                self.env["account.move.line"]
+                .search(
+                    [
+                        ("move_id.state", "!=", "posted"),
+                        ("delivery_note_line_id", "in", dn_lines.ids),
+                    ]
+                )
+                .mapped("delivery_note_line_id")
+            )
+            dn_lines -= invoiced_dn_lines
+
             inv_lines = all_invoice_lines.filtered(
                 lambda line, s=sol: s in line.sale_line_ids
                 and not line.delivery_note_line_id