diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index c2b9625..8de7bdd 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -209,11 +209,13 @@ class PurchaseTradeTestCase(ModuleTestCase):
         self.assertEqual(target[0]['amount'], Decimal('-60.00'))
         self.assertEqual(target[0]['mtm_price'], Decimal('60.0000'))
         self.assertEqual(target[0]['mtm_price_prev'], Decimal('54.0000'))
+        self.assertEqual(target[0]['amount_prev'], Decimal('-540.00'))
         self.assertEqual(target[0]['mtm'], Decimal('-600.00'))
         self.assertEqual(target[1]['mtm_curve'], curve_b.id)
         self.assertEqual(target[1]['amount'], Decimal('-40.00'))
         self.assertEqual(target[1]['mtm_price'], Decimal('20.0000'))
         self.assertEqual(target[1]['mtm_price_prev'], Decimal('18.0000'))
+        self.assertEqual(target[1]['amount_prev'], Decimal('-180.00'))
         self.assertEqual(target[1]['mtm'], Decimal('-200.00'))
 
     @with_transaction()
diff --git a/modules/purchase_trade/valuation.py b/modules/purchase_trade/valuation.py
index cb41ab8..9c49721 100644
--- a/modules/purchase_trade/valuation.py
+++ b/modules/purchase_trade/valuation.py
@@ -56,6 +56,7 @@ class ValuationBase(ModelSQL):
     quantity = fields.Numeric("Quantity",digits=(16,5))
     unit = fields.Many2One('product.uom',"Unit")
     amount = fields.Numeric("Amount",digits=(16,2))
+    amount_prev = fields.Numeric("Amount -1", digits=(16, 2))
     mtm_price = fields.Numeric("Mtm Price", digits=(16,4))
     mtm_price_prev = fields.Numeric("Mtm Price -1", digits=(16,4))
     mtm_curve = fields.Many2One('price.price', "Curve")
@@ -444,6 +445,7 @@ class ValuationBase(ModelSQL):
             line_values = dict(values)
             line_values['mtm_price'] = cls._get_strategy_mtm_price(
                 strategy, line)
+            line_values['amount_prev'] = None
             line_values['mtm'] = cls._signed_strategy_mtm(
                 values, strategy, line)
             line_values['strategy'] = strategy
@@ -478,6 +480,11 @@ class ValuationBase(ModelSQL):
             line_values['mtm_price'] = mtm_price
             line_values['mtm_price_prev'] = mtm_price_prev
             line_values['mtm_curve'] = component.price_index.id
+            line_values['amount_prev'] = (
+                round(
+                    mtm_price_prev * Decimal(values['quantity'])
+                    * signed_factor, 2)
+                if mtm_price_prev is not None else None)
             line_values['mtm'] = round(
                 mtm_price * Decimal(values['quantity']) * signed_factor, 2)
             line_values['strategy'] = strategy
@@ -500,6 +507,7 @@ class ValuationBase(ModelSQL):
             line_values['mtm_price'] = mtm_price
             line_values['mtm_price_prev'] = None
             line_values['mtm_curve'] = None
+            line_values['amount_prev'] = None
             line_values['mtm'] = round(
                 mtm_price * Decimal(values['quantity']) * signed_factor, 2)
             line_values['strategy'] = strategy
diff --git a/modules/purchase_trade/view/valuation_list.xml b/modules/purchase_trade/view/valuation_list.xml
index 5d6f03b..8457d6a 100644
--- a/modules/purchase_trade/view/valuation_list.xml
+++ b/modules/purchase_trade/view/valuation_list.xml
@@ -10,7 +10,11 @@
     <field name="state"/>
     <field name="price"/>
     <field name="quantity" symbol="unit"/>
-    <field name="amount"/>
+    <field name="amount"
+        sum="1"
+        sum_previous="amount_prev"
+        sum_variation="1"/>
+    <field name="amount_prev" optional="1"/>
     <field name="base_amount" sum="1"/>
     <field name="rate"/>
     <field name="strategy"/>
diff --git a/modules/purchase_trade/view/valuation_tree_sequence3.xml b/modules/purchase_trade/view/valuation_tree_sequence3.xml
index 30dfa21..718374d 100755
--- a/modules/purchase_trade/view/valuation_tree_sequence3.xml
+++ b/modules/purchase_trade/view/valuation_tree_sequence3.xml
@@ -11,7 +11,11 @@ this repository contains the full copyright notices and license terms. -->
     <field name="state"/>
     <field name="price"/>
     <field name="quantity" symbol="unit"/>
-    <field name="amount" sum="1"/>
+    <field name="amount"
+        sum="1"
+        sum_previous="amount_prev"
+        sum_variation="1"/>
+    <field name="amount_prev" optional="1"/>
     <field name="strategy"/>
     <field name="mtm_curve"/>
     <field name="mtm_price"