[IMP] product_pricelist_total_margin: Add margin_type selector (Markup vs Commercial Margin)

- Add margin_type field to choose between calculation methods:
  * Markup (on cost): PVP = Cost × (1 + markup%)
  * Commercial Margin (on PVP): PVP = Cost / (1 - margin%)
- Update _compute_price() to apply correct formula based on margin_type
- Add safety cap for commercial margin >= 100% (caps at 99%)
- Add detailed logging for both calculation types
- Update views to show margin_type field when use_total_margin is enabled
- Add 2 new tests to validate both calculation methods:
  * test_total_margin_markup_type: validates markup formula
  * test_total_margin_commercial_margin_type: validates commercial margin formula
- All 11 tests passing (9 existing + 2 new)

Example with Commercial Margin:
Base: 4.68€, Total Margin: 20%
- Markup: 4.68 × 1.20 = 5.616€ (margin = 16.67% of PVP)
- Commercial Margin: 4.68 / 0.80 = 5.85€ (margin = 20% of PVP) ✓

product_pricelist_total_margin/__manifest__.py

@@ -5,8 +5,8 @@
     "version": "18.0.1.0.0",
     "category": "Sales/Products",
     "summary": "Calculate total margin additively instead of compounding in chained pricelists",
-    "author": "Odoo Community Association (OCA), Kidekoop",
+    "author": "Odoo Community Association (OCA), Criptomart",
-    "website": "https://github.com/kidekoop",
+    "website": "https://git.criptomart.net/criptomart/addons-cm",
     "license": "AGPL-3",
     "depends": [
         "product",

product_pricelist_total_margin/models/product_pricelist_item.py

@@ -23,6 +23,20 @@ class ProductPricelistItem(models.Model):
         "- Total (this option): 100 * (1 + 0.20) = 120€",
     )
 
+    margin_type = fields.Selection(
+        selection=[
+            ("markup", "Markup (on cost)"),
+            ("margin", "Commercial Margin (on PVP)"),
+        ],
+        string="Margin Type",
+        default="markup",
+        help="Type of margin calculation:\n"
+        "- Markup: PVP = Cost × (1 + markup%). Margin is calculated on cost.\n"
+        "  Example: Cost 100€, Markup 25% → PVP = 125€\n\n"
+        "- Commercial Margin: PVP = Cost / (1 - margin%). Margin is calculated on PVP.\n"
+        "  Example: Cost 100€, Margin 20% → PVP = 125€ (margin = 25€/125€ = 20%)",
+    )
+
     def _get_base_price_and_margins(self, product, quantity, uom, date, currency):
         """
         Traverse the pricelist chain to get the original base price and collect
@@ -367,10 +381,28 @@ class ProductPricelistItem(models.Model):
             # Apply global min/max margin limits
             total_margin = self._apply_global_margin_limits(total_margin, base_price)
 
-            # Apply total margin to base price
+            # Apply total margin to base price using selected margin type
+            margin_type = self.margin_type or "markup"
+            if margin_type == "margin":
+                # Commercial Margin: PVP = Cost / (1 - margin%)
+                if total_margin >= 100:
+                    _logger.warning(
+                        "[TOTAL MARGIN] Commercial margin %.2f%% >= 100%%, capping at 99%%",
+                        total_margin,
+                    )
+                    total_margin = 99.0
+                price = base_price / (1 - total_margin / 100)
+                _logger.info(
+                    "[TOTAL MARGIN] Commercial Margin: Base %.2f / (1 - %.2f%%) = %.2f",
+                    base_price,
+                    total_margin,
+                    price,
+                )
+            else:
+                # Markup: PVP = Cost × (1 + markup%)
                 price = base_price * (1 + total_margin / 100)
                 _logger.info(
-                "[TOTAL MARGIN] Base price %.2f * (1 + %.2f%%) = %.2f",
+                    "[TOTAL MARGIN] Markup: Base %.2f * (1 + %.2f%%) = %.2f",
                     base_price,
                     total_margin,
                     price,

product_pricelist_total_margin/tests/test_total_margin.py

@@ -351,3 +351,63 @@ class TestTotalMargin(TransactionCase):
         self.env["ir.config_parameter"].sudo().set_param(
             "product_pricelist_total_margin.max_percent", "0.0"
         )
+
+    def test_total_margin_markup_type(self):
+        """Test total margin with Markup calculation (on cost)."""
+        # Enable total margin and set to markup
+        self.item_base.use_total_margin = True
+        self.item_chained.use_total_margin = True
+        self.item_chained.margin_type = "markup"
+
+        price = self.pricelist_chained._get_product_price(
+            product=self.product,
+            quantity=1.0,
+        )
+
+        # Expected calculation (Markup):
+        # Base: 4.68
+        # Total margin: -5% + 25% = 20%
+        # Markup formula: PVP = Cost × (1 + markup%)
+        # Final: 4.68 * (1 + 0.20) = 5.616
+        expected_price = 4.68 * 1.20
+        self.assertAlmostEqual(
+            price,
+            expected_price,
+            places=2,
+            msg=f"Markup calculation should give {expected_price}, got {price}",
+        )
+
+    def test_total_margin_commercial_margin_type(self):
+        """Test total margin with Commercial Margin calculation (on PVP)."""
+        # Enable total margin and set to commercial margin
+        self.item_base.use_total_margin = True
+        self.item_chained.use_total_margin = True
+        self.item_chained.margin_type = "margin"
+
+        price = self.pricelist_chained._get_product_price(
+            product=self.product,
+            quantity=1.0,
+        )
+
+        # Expected calculation (Commercial Margin):
+        # Base: 4.68
+        # Total margin: -5% + 25% = 20%
+        # Commercial margin formula: PVP = Cost / (1 - margin%)
+        # Final: 4.68 / (1 - 0.20) = 5.85
+        expected_price = 4.68 / 0.80
+        self.assertAlmostEqual(
+            price,
+            expected_price,
+            places=2,
+            msg=f"Commercial margin calculation should give {expected_price}, got {price}",
+        )
+
+        # Verify the commercial margin is indeed 20%
+        # Commercial margin = (PVP - Cost) / PVP
+        commercial_margin = (price - 4.68) / price
+        self.assertAlmostEqual(
+            commercial_margin,
+            0.20,
+            places=4,
+            msg=f"Commercial margin should be 20%, got {commercial_margin * 100}%",
+        )

product_pricelist_total_margin/views/product_pricelist_item_views.xml

@@ -5,12 +5,16 @@
         <field name="model">product.pricelist.item</field>
         <field name="inherit_id" ref="product.product_pricelist_item_form_view" />
         <field name="arch" type="xml">
-            <!-- Add use_total_margin field after compute_price -->
+            <!-- Add use_total_margin and margin_type fields after compute_price -->
             <field name="compute_price" position="after">
                 <field
                     name="use_total_margin"
                     invisible="compute_price != 'formula' or base != 'pricelist'"
                 />
+                <field
+                    name="margin_type"
+                    invisible="not use_total_margin"
+                />
             </field>
         </field>
     </record>