diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index 32b612f..2d75e41 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -2781,16 +2781,19 @@ class ValuationDyn(metaclass=PoolMeta):
         Sum(val.quantity).as_('r_quantity'),
         Max(val.unit).as_('r_unit'),
         Sum(val.amount).as_('r_amount'),
+        Sum(val.amount_prev).as_('r_amount_prev'),
         Sum(val.base_amount).as_('r_base_amount'),
         Sum(val.rate).as_('r_rate'),
         Avg(val.mtm_price).as_('r_mtm_price'),
+        Avg(val.mtm_price_prev).as_('r_mtm_price_prev'),
+        val.mtm_curve.as_('r_mtm_curve'),
         Sum(val.mtm).as_('r_mtm'),
         Max(val.strategy).as_('r_strategy'),
         Max(val.lot).as_('r_lot'),
         Max(val.sale_line).as_('r_sale_line'),
         Max(val.shipment_in).as_('r_shipment_in'),
         where=wh,
-        group_by=[val.purchase,val.sale])
+        group_by=[val.purchase, val.sale, val.mtm_curve])
             
         return query    
 
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index 5d17459..4ae6a9c 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -1841,6 +1841,34 @@ class PurchaseTradeTestCase(ModuleTestCase):
             Valuation._value_key(base),
             Valuation._value_key(regenerated))
 
+    def test_snapshot_identity_keeps_mtm_curves_distinct(self):
+        'valuation snapshot identity keeps strategy curves distinct'
+        Valuation = Pool().get('valuation.valuation')
+        base = {
+            'purchase': 1,
+            'line': 2,
+            'sale': None,
+            'sale_line': None,
+            'lot': 5,
+            'type': 'pur. priced',
+            'reference': 'Open',
+            'counterparty': 6,
+            'product': 7,
+            'state': 'fixed',
+            'strategy': 8,
+            'shipment_in': None,
+            'mtm_curve': 10,
+        }
+        other_curve = base.copy()
+        other_curve['mtm_curve'] = 20
+
+        self.assertNotEqual(
+            Valuation._value_key(base),
+            Valuation._value_key(other_curve))
+        self.assertIn(
+            ('mtm_curve', '=', 10),
+            Valuation._snapshot_identity_domain(base))
+
     def test_generate_from_matched_sale_line_does_not_create_snapshot(self):
         'matched sale line pnl is owned by the matched purchase line'
         Valuation = Pool().get('valuation.valuation')
diff --git a/modules/purchase_trade/valuation.py b/modules/purchase_trade/valuation.py
index 31baedb..cee059a 100644
--- a/modules/purchase_trade/valuation.py
+++ b/modules/purchase_trade/valuation.py
@@ -337,6 +337,7 @@ class ValuationBase(ModelSQL):
             value.get('state'),
             value.get('strategy'),
             value.get('shipment_in'),
+            value.get('mtm_curve'),
         )
 
     @classmethod
@@ -362,6 +363,7 @@ class ValuationBase(ModelSQL):
             ('state', '=', value.get('state')),
             ('strategy', '=', value.get('strategy')),
             ('shipment_in', '=', value.get('shipment_in')),
+            ('mtm_curve', '=', value.get('mtm_curve')),
         ]
         if value.get('sale_line'):
             domain.append(('sale_line', '=', value.get('sale_line')))
@@ -1508,9 +1510,12 @@ class ValuationDyn(ModelSQL,ModelView):
     r_quantity = fields.Numeric("Quantity",digits='r_unit')
     r_unit = fields.Many2One('product.uom',"Unit")
     r_amount = fields.Numeric("Amount",digits='r_unit')
+    r_amount_prev = fields.Numeric("Amount -1", digits='r_unit')
     r_base_amount = fields.Numeric("Base Amount",digits='r_unit')
     r_rate = fields.Numeric("Rate",digits=(16,6))
     r_mtm_price = fields.Numeric("Mtm Price",digits='r_unit')
+    r_mtm_price_prev = fields.Numeric("Mtm Price -1", digits='r_unit')
+    r_mtm_curve = fields.Many2One('price.price', "Curve")
     r_mtm = fields.Numeric("Mtm",digits='r_unit')
     r_strategy = fields.Many2One('mtm.strategy',"Strategy")
     r_lot = fields.Many2One('lot.lot',"Lot")
@@ -1543,15 +1548,18 @@ class ValuationDyn(ModelSQL,ModelView):
         Sum(val.quantity).as_('r_quantity'),
         Max(val.unit).as_('r_unit'),
         Sum(val.amount).as_('r_amount'),
+        Sum(val.amount_prev).as_('r_amount_prev'),
         Sum(val.base_amount).as_('r_base_amount'),
         Sum(val.rate).as_('r_rate'),
         Avg(val.mtm_price).as_('r_mtm_price'),
+        Avg(val.mtm_price_prev).as_('r_mtm_price_prev'),
+        val.mtm_curve.as_('r_mtm_curve'),
         Sum(val.mtm).as_('r_mtm'),
         Max(val.strategy).as_('r_strategy'),
         Max(val.lot).as_('r_lot'),
         Max(val.shipment_in).as_('r_shipment_in'),
         where=wh,
-        group_by=[val.type,val.counterparty,val.state])
+        group_by=[val.type, val.counterparty, val.state, val.mtm_curve])
             
         return query    
 
diff --git a/modules/purchase_trade/view/valuation_tree_sequence4.xml b/modules/purchase_trade/view/valuation_tree_sequence4.xml
index c66c279..0070c03 100755
--- a/modules/purchase_trade/view/valuation_tree_sequence4.xml
+++ b/modules/purchase_trade/view/valuation_tree_sequence4.xml
@@ -10,9 +10,19 @@ this repository contains the full copyright notices and license terms. -->
     <field name="r_state"/>
     <field name="r_price"/>
     <field name="r_quantity" symbol="r_unit"/>
-    <field name="r_amount" sum="1"/>
+    <field name="r_amount"
+        sum="1"
+        sum_previous="r_amount_prev"
+        sum_variation="1"/>
+    <field name="r_amount_prev" optional="1"/>
     <field name="r_strategy"/>
-    <field name="r_mtm_price"/>
+    <field name="r_mtm_curve"/>
+    <field name="r_mtm_price"
+        widget="variation"
+        variation_previous="r_mtm_price_prev"
+        variation_group_by="r_mtm_curve"
+        variation_summary="1"/>
+    <field name="r_mtm_price_prev" optional="1"/>
     <field name="r_mtm" optional="0" sum="1"/>
 </tree>