down payment with original taxes

sale_usability/__init__.py

@@ -1 +1,2 @@
 from . import models
+from . import wizard

sale_usability/wizard/__init__.py

@@ -0,0 +1 @@
+from . import sale_make_invoice_advance

sale_usability/wizard/sale_make_invoice_advance.py

@@ -0,0 +1,37 @@
+from odoo import models
+from odoo.tools import float_is_zero
+
+
+class SaleAdvancePaymentInv(models.TransientModel):
+    _inherit = "sale.advance.payment.inv"
+
+    def _prepare_invoice_values(self, order, name, amount, so_line):
+        """
+        Create as many invoice lines as order lines with their original
+        order line taxes. Lines quantities have the ratio of the advance payment.
+        """
+        invoice_vals = super()._prepare_invoice_values(order, name, amount, so_line)
+        lines = []
+        uom_precision_digits = self.env["decimal.precision"].precision_get(
+            "Product Unit of Measure"
+        )
+        for line in order.order_line:
+            if (
+                not float_is_zero(
+                    # avoids taking lines like previous advance payments
+                    line.product_uom_qty, precision_digits=uom_precision_digits
+                )
+            ):
+                lines.append((0, 0, {
+                    "name": name,
+                    "price_unit": line.price_unit,
+                    "quantity": line.product_uom_qty * amount / order.amount_total,
+                    "product_id": line.product_id.id,
+                    "product_uom_id": line.product_uom.id,
+                    "tax_ids": [(6, 0, line.tax_id.ids)],
+                    "sale_line_ids": [(6, 0, [line.id])],
+                    "analytic_tag_ids": [(6, 0, line.analytic_tag_ids.ids)],
+                    "analytic_account_id": order.analytic_account_id.id or False,
+                }))
+        invoice_vals["invoice_line_ids"] = lines
+        return invoice_vals