[FIX] purchase/sale_product_matrix: fix sequence of order lines

- Install Sales and Sale Matrix
- Go to Sales > Configuration > Settings and activate "Variant Grid Entry"
- Go to Products and edit a product with variants (lets call it "Product A"):
  * For "Sales Variant Selection" in "Variants tab", choose "Order Grid Entry"
- Go to Sales > Orders > Quotations and create a quotation
  * Add any product without Variant Selection set to "Order Grid Entry"
  * Add "Product A" with 1 attribute
  * Add any product without Variant Selection set to "Order Grid Entry"
- Here there are 3 products in the quotation with "Product A" at the second position
- Save the quotation
After the save the position of "Product A" is moved to the last position.

In a new quotation, every new order line has a sequence set to 10, except for products
with Variant Selection set to "Order Grid Entry" that set the sequence to the previous one +1,
which will put it in the last position even if another product is added after it.

[All of the above steps and explanations can also be applied to Purchase]

opw-2303096

closes odoo/odoo#55342

X-original-commit: 17c1caec
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/purchase_product_matrix/models/purchase.py

@@ -90,7 +90,7 @@ class PurchaseOrder(models.Model):
                         default_po_line_vals = OrderLine.default_get(OrderLine._fields.keys())
                     last_sequence = self.order_line[-1:].sequence
                     if last_sequence:
-                        default_po_line_vals['sequence'] = last_sequence + 1
+                        default_po_line_vals['sequence'] = last_sequence
                     new_lines.append((0, 0, dict(
                         default_po_line_vals,
                         product_id=product.id,

addons/sale_product_matrix/models/sale_order.py

@@ -101,7 +101,7 @@ class SaleOrder(models.Model):
                         default_so_line_vals = OrderLine.default_get(OrderLine._fields.keys())
                     last_sequence = self.order_line[-1:].sequence
                     if last_sequence:
-                        default_so_line_vals['sequence'] = last_sequence + 1
+                        default_so_line_vals['sequence'] = last_sequence
                     new_lines.append((0, 0, dict(
                         default_so_line_vals,
                         product_id=product.id,