diff --git a/product_sale_price_from_pricelist/__manifest__.py b/product_sale_price_from_pricelist/__manifest__.py
index 3303455..760feee 100644
--- a/product_sale_price_from_pricelist/__manifest__.py
+++ b/product_sale_price_from_pricelist/__manifest__.py
@@ -2,7 +2,7 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 {  # noqa: B018
     "name": "Product Sale Price from Pricelist",
-    "version": "18.0.2.0.0",
+    "version": "18.0.2.1.0",
     "category": "product",
     "summary": "Set sale price from pricelist based on last purchase price",
     "author": "Odoo Community Association (OCA), Criptomart",
diff --git a/product_sale_price_from_pricelist/migrations/18.0.2.1.0/pre-migrate.py b/product_sale_price_from_pricelist/migrations/18.0.2.1.0/pre-migrate.py
new file mode 100644
index 0000000..447a730
--- /dev/null
+++ b/product_sale_price_from_pricelist/migrations/18.0.2.1.0/pre-migrate.py
@@ -0,0 +1,72 @@
+# Copyright 2026 Criptomart
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+import logging
+
+_logger = logging.getLogger(__name__)
+
+
+def migrate(cr, version):
+    """Migrate price fields from product.template to product.product.
+
+    In version 18.0.2.1.0, these fields were moved from product.template
+    to product.product for proper variant handling:
+    - last_purchase_price_received
+    - list_price_theoritical
+    - last_purchase_price_updated
+    - last_purchase_price_compute_type
+    """
+    if not version:
+        return
+
+    _logger.info("Migrating price fields from product.template to product.product...")
+
+    # Migrate last_purchase_price_received
+    cr.execute("""
+        UPDATE product_product pp
+        SET last_purchase_price_received = pt.last_purchase_price_received
+        FROM product_template pt
+        WHERE pp.product_tmpl_id = pt.id
+          AND pt.last_purchase_price_received IS NOT NULL
+          AND (pp.last_purchase_price_received IS NULL
+               OR pp.last_purchase_price_received = '{}')
+        """)
+    _logger.info("Migrated last_purchase_price_received: %d rows", cr.rowcount)
+
+    # Migrate list_price_theoritical
+    cr.execute("""
+        UPDATE product_product pp
+        SET list_price_theoritical = pt.list_price_theoritical
+        FROM product_template pt
+        WHERE pp.product_tmpl_id = pt.id
+          AND pt.list_price_theoritical IS NOT NULL
+          AND (pp.list_price_theoritical IS NULL
+               OR pp.list_price_theoritical = '{}')
+        """)
+    _logger.info("Migrated list_price_theoritical: %d rows", cr.rowcount)
+
+    # Migrate last_purchase_price_updated
+    cr.execute("""
+        UPDATE product_product pp
+        SET last_purchase_price_updated = pt.last_purchase_price_updated
+        FROM product_template pt
+        WHERE pp.product_tmpl_id = pt.id
+          AND pt.last_purchase_price_updated IS NOT NULL
+          AND (pp.last_purchase_price_updated IS NULL
+               OR pp.last_purchase_price_updated = '{}')
+        """)
+    _logger.info("Migrated last_purchase_price_updated: %d rows", cr.rowcount)
+
+    # Migrate last_purchase_price_compute_type
+    cr.execute("""
+        UPDATE product_product pp
+        SET last_purchase_price_compute_type = pt.last_purchase_price_compute_type
+        FROM product_template pt
+        WHERE pp.product_tmpl_id = pt.id
+          AND pt.last_purchase_price_compute_type IS NOT NULL
+          AND (pp.last_purchase_price_compute_type IS NULL
+               OR pp.last_purchase_price_compute_type = '{}')
+        """)
+    _logger.info("Migrated last_purchase_price_compute_type: %d rows", cr.rowcount)
+
+    _logger.info("Migration of price fields completed.")
diff --git a/product_sale_price_from_pricelist/models/stock_move.py b/product_sale_price_from_pricelist/models/stock_move.py
index 9e5a408..ca933c9 100644
--- a/product_sale_price_from_pricelist/models/stock_move.py
+++ b/product_sale_price_from_pricelist/models/stock_move.py
@@ -56,6 +56,23 @@ class StockMove(models.Model):
                     price_updated, move.product_id.uom_id
                 )
 
+            _logger.info(
+                "[PRICE DEBUG] Product %s [%s]: price_updated=%.2f, current_price=%.2f, quantity=%.2f, will_update=%s",
+                move.product_id.default_code or move.product_id.name,
+                move.product_id.id,
+                price_updated,
+                move.product_id.last_purchase_price_received,
+                move.quantity,
+                bool(
+                    float_compare(
+                        move.product_id.last_purchase_price_received,
+                        price_updated,
+                        precision_digits=2,
+                    )
+                    and not float_is_zero(move.quantity, precision_digits=3)
+                ),
+            )
+
             if float_compare(
                 move.product_id.last_purchase_price_received,
                 price_updated,
@@ -82,5 +99,13 @@ class StockMove(models.Model):
                         "last_purchase_price_received": price_updated,
                     }
                 )
+                # Verify write was successful
+                product_company.invalidate_recordset()
+                _logger.info(
+                    "[PRICE DEBUG] Product %s [%s]: After write, last_purchase_price_received=%.2f",
+                    product_company.default_code or product_company.name,
+                    product_company.id,
+                    product_company.last_purchase_price_received,
+                )
                 product_company._compute_theoritical_price()
         return res
diff --git a/product_sale_price_from_pricelist/tests/__init__.py b/product_sale_price_from_pricelist/tests/__init__.py
index b14ee57..89313bf 100644
--- a/product_sale_price_from_pricelist/tests/__init__.py
+++ b/product_sale_price_from_pricelist/tests/__init__.py
@@ -1,4 +1,7 @@
+# flake8: noqa: F401
+# Imports are used by Odoo test framework to register tests
 from . import test_product_template
 from . import test_stock_move
 from . import test_pricelist
 from . import test_res_config
+from . import test_theoretical_price
diff --git a/product_sale_price_from_pricelist/tests/test_stock_move.py b/product_sale_price_from_pricelist/tests/test_stock_move.py
index 1c747f8..16b87e8 100644
--- a/product_sale_price_from_pricelist/tests/test_stock_move.py
+++ b/product_sale_price_from_pricelist/tests/test_stock_move.py
@@ -119,8 +119,49 @@ class TestStockMove(TransactionCase):
         picking.button_validate()
 
         # Verify price was updated
+        self.product.invalidate_recordset()
         self.assertEqual(self.product.last_purchase_price_received, 8.0)
 
+    def test_full_flow_updates_theoretical_price(self):
+        """Test that validating a purchase receipt updates theoretical price."""
+        # Initial state
+        self.product.write(
+            {
+                "last_purchase_price_received": 0.0,
+                "list_price_theoritical": 0.0,
+            }
+        )
+        self.product.invalidate_recordset()
+
+        # Create and confirm purchase order at 100.0
+        purchase_order = self._create_purchase_order(self.product, qty=5, price=100.0)
+        purchase_order.button_confirm()
+
+        # Validate the picking
+        picking = purchase_order.picking_ids[0]
+        picking.action_assign()
+        for move in picking.move_ids:
+            move.quantity = move.product_uom_qty
+        picking.button_validate()
+
+        # Re-read from DB
+        self.product.invalidate_recordset()
+
+        # Verify last_purchase_price_received was updated
+        self.assertEqual(
+            self.product.last_purchase_price_received,
+            100.0,
+            "last_purchase_price_received should be 100.0 after receipt",
+        )
+
+        # Verify theoretical price was calculated (100.0 * 1.5 = 150.0 with 50% markup)
+        self.assertAlmostEqual(
+            self.product.list_price_theoritical,
+            150.0,
+            places=2,
+            msg=f"Theoretical price should be 150.0, got {self.product.list_price_theoritical}",
+        )
+
     def test_update_price_with_first_discount(self):
         """Test price update with first discount only"""
         if not hasattr(self.env["purchase.order.line"], "discount1"):
diff --git a/product_sale_price_from_pricelist/tests/test_theoretical_price.py b/product_sale_price_from_pricelist/tests/test_theoretical_price.py
new file mode 100644
index 0000000..c5baff7
--- /dev/null
+++ b/product_sale_price_from_pricelist/tests/test_theoretical_price.py
@@ -0,0 +1,151 @@
+# Copyright (C) 2026: Criptomart (https://criptomart.net)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo.tests import tagged
+from odoo.tests.common import TransactionCase
+
+
+@tagged("post_install", "-at_install")
+class TestTheoreticalPriceCalculation(TransactionCase):
+    """Test the theoretical price calculation to diagnose issues."""
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+
+        # Create tax
+        cls.tax = cls.env["account.tax"].create(
+            {
+                "name": "Test Tax 10%",
+                "amount": 10.0,
+                "amount_type": "percent",
+                "type_tax_use": "sale",
+            }
+        )
+
+        # Create pricelist with last_purchase_price base and 10% markup
+        cls.pricelist = cls.env["product.pricelist"].create(
+            {
+                "name": "Test Auto Pricelist",
+                "currency_id": cls.env.company.currency_id.id,
+            }
+        )
+
+        cls.pricelist_item = cls.env["product.pricelist.item"].create(
+            {
+                "pricelist_id": cls.pricelist.id,
+                "compute_price": "formula",
+                "base": "last_purchase_price",
+                "price_discount": -10.0,  # 10% markup (negative discount)
+                "applied_on": "3_global",
+            }
+        )
+
+        # Configure the pricelist in settings
+        cls.env["ir.config_parameter"].sudo().set_param(
+            "product_sale_price_from_pricelist.product_pricelist_automatic",
+            str(cls.pricelist.id),
+        )
+
+        # Create product.product directly
+        cls.product = cls.env["product.product"].create(
+            {
+                "name": "Test Product Direct",
+                "list_price": 10.0,
+                "standard_price": 5.0,
+                "taxes_id": [(6, 0, [cls.tax.id])],
+            }
+        )
+
+    def test_write_last_purchase_price_on_product(self):
+        """Test that writing last_purchase_price_received on product.product works."""
+        # Write directly to product.product
+        self.product.write({"last_purchase_price_received": 100.0})
+
+        # Re-read from DB to ensure value is persisted
+        self.product.invalidate_recordset()
+        self.assertEqual(
+            self.product.last_purchase_price_received,
+            100.0,
+            "last_purchase_price_received should be 100.0 after write",
+        )
+
+    def test_compute_theoretical_price_from_product(self):
+        """Test computing theoretical price when called on product.product."""
+        # Set purchase price
+        self.product.write(
+            {
+                "last_purchase_price_received": 100.0,
+                "last_purchase_price_compute_type": "without_discounts",
+            }
+        )
+        self.product.invalidate_recordset()
+
+        # Verify price was written
+        self.assertEqual(self.product.last_purchase_price_received, 100.0)
+
+        # Compute theoretical price
+        self.product._compute_theoritical_price()
+        self.product.invalidate_recordset()
+
+        # Expected: 100.0 * 1.10 = 110.0 (10% markup)
+        self.assertAlmostEqual(
+            self.product.list_price_theoritical,
+            110.0,
+            places=2,
+            msg=f"Theoretical price should be 110.0, got {self.product.list_price_theoritical}",
+        )
+
+    def test_compute_theoretical_price_from_template(self):
+        """Test computing theoretical price when called on product.template."""
+        template = self.product.product_tmpl_id
+
+        # Set purchase price on variant
+        self.product.write(
+            {
+                "last_purchase_price_received": 100.0,
+                "last_purchase_price_compute_type": "without_discounts",
+            }
+        )
+        self.product.invalidate_recordset()
+
+        # Verify price was written
+        self.assertEqual(self.product.last_purchase_price_received, 100.0)
+
+        # Compute theoretical price via template
+        template._compute_theoritical_price()
+        self.product.invalidate_recordset()
+
+        # Expected: 100.0 * 1.10 = 110.0 (10% markup)
+        self.assertAlmostEqual(
+            self.product.list_price_theoritical,
+            110.0,
+            places=2,
+            msg=f"Theoretical price should be 110.0, got {self.product.list_price_theoritical}",
+        )
+
+    def test_field_storage_location(self):
+        """Test that fields are stored on product.product, not product.template."""
+        # Check field definitions
+        product_fields = self.env["product.product"]._fields
+        template_fields = self.env["product.template"]._fields
+
+        # These should be stored fields on product.product
+        self.assertFalse(
+            product_fields["last_purchase_price_received"].compute,
+            "last_purchase_price_received should NOT be computed on product.product",
+        )
+        self.assertFalse(
+            product_fields["list_price_theoritical"].compute,
+            "list_price_theoritical should NOT be computed on product.product",
+        )
+
+        # These should be computed fields on product.template
+        self.assertTrue(
+            template_fields["last_purchase_price_received"].compute,
+            "last_purchase_price_received should be computed on product.template",
+        )
+        self.assertTrue(
+            template_fields["list_price_theoritical"].compute,
+            "list_price_theoritical should be computed on product.template",
+        )