diff --git a/modules/purchase_trade/cron.py b/modules/purchase_trade/cron.py
index f9b2fe8..6b4f022 100755
--- a/modules/purchase_trade/cron.py
+++ b/modules/purchase_trade/cron.py
@@ -12,9 +12,12 @@ class Cron(metaclass=PoolMeta):
 
     @classmethod
     def __setup__(cls):
-        super().__setup__()
-        cls.method.selection.append(
-            ('forex.cron|update_forex', "Update Forex Prices"))
+        super().__setup__()
+        cls.method.selection.append(
+            ('forex.cron|update_forex', "Update Forex Prices"))
+        cls.method.selection.append(
+            ('valuation.valuation|update_daily_snapshot',
+                "Update Valuation Snapshot"))
 
 class PriceCron(ModelSQL, ModelView):
     "Price Cron"
diff --git a/modules/purchase_trade/cron.xml b/modules/purchase_trade/cron.xml
index 48d7ffb..32aff6c 100755
--- a/modules/purchase_trade/cron.xml
+++ b/modules/purchase_trade/cron.xml
@@ -36,10 +36,16 @@
         <field name="model" search="[('model', '=', 'forex.cron')]"/>
     </record> -->
 
-    <record model="ir.cron" id="cron_cron">
-        <field name="method">forex.cron|update_forex</field>
-        <field name="interval_number" eval="1"/>
-        <field name="interval_type">days</field>
-    </record>
-  </data>
-</tryton>
+    <record model="ir.cron" id="cron_cron">
+        <field name="method">forex.cron|update_forex</field>
+        <field name="interval_number" eval="1"/>
+        <field name="interval_type">days</field>
+    </record>
+
+    <record model="ir.cron" id="valuation_daily_snapshot_cron">
+        <field name="method">valuation.valuation|update_daily_snapshot</field>
+        <field name="interval_number" eval="1"/>
+        <field name="interval_type">days</field>
+    </record>
+  </data>
+</tryton>
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index 8de7bdd..78225f7 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -722,6 +722,38 @@ class PurchaseTradeTestCase(ModuleTestCase):
             {'type': 'derivative'},
         ])
 
+    def test_update_daily_snapshot_generates_all_purchases_and_unmatched_sales(self):
+        'daily valuation cron snapshots purchases and unmatched sale lines'
+        Valuation = Pool().get('valuation.valuation')
+        PurchaseLine = Mock()
+        SaleLine = Mock()
+        purchase_lines = [Mock(id=1), Mock(id=2)]
+        unmatched_sale_line = Mock(id=3)
+        unmatched_sale_line.get_matched_lines.return_value = []
+        matched_sale_line = Mock(id=4)
+        matched_sale_line.get_matched_lines.return_value = [
+            Mock(lot_p=Mock(line=Mock(id=5)))]
+        PurchaseLine.search.return_value = purchase_lines
+        SaleLine.search.return_value = [unmatched_sale_line, matched_sale_line]
+
+        with patch(
+                'trytond.modules.purchase_trade.valuation.Pool'
+                ) as PoolMock, patch.object(
+                    Valuation, 'generate') as generate, patch.object(
+                    Valuation, 'generate_from_sale_line'
+                    ) as generate_from_sale_line:
+            PoolMock.return_value.get.side_effect = lambda name: {
+                'purchase.line': PurchaseLine,
+                'sale.line': SaleLine,
+            }[name]
+
+            Valuation.update_daily_snapshot()
+
+        generate.assert_any_call(purchase_lines[0])
+        generate.assert_any_call(purchase_lines[1])
+        self.assertEqual(generate.call_count, 2)
+        generate_from_sale_line.assert_called_once_with(unmatched_sale_line)
+
     def test_create_pnl_fee_from_line_accepts_missing_rate_amount(self):
         'purchase fee valuation treats an uncomputed rate amount as zero'
         Valuation = Pool().get('valuation.valuation')
diff --git a/modules/purchase_trade/valuation.py b/modules/purchase_trade/valuation.py
index 2e31631..23304cd 100644
--- a/modules/purchase_trade/valuation.py
+++ b/modules/purchase_trade/valuation.py
@@ -1225,6 +1225,29 @@ class Valuation(ValuationBase, ModelView):
     "Valuation"
     __name__ = 'valuation.valuation'
 
+    @classmethod
+    def update_daily_snapshot(cls):
+        PurchaseLine = Pool().get('purchase.line')
+        SaleLine = Pool().get('sale.line')
+
+        purchase_lines = PurchaseLine.search([])
+        sale_lines = [
+            sale_line for sale_line in SaleLine.search([])
+            if cls._sale_line_is_unmatched(sale_line)
+        ]
+
+        for line in purchase_lines:
+            cls.generate(line)
+
+        for sale_line in sale_lines:
+            cls.generate_from_sale_line(sale_line)
+
+        logger.info(
+            "Updated valuation snapshot for %s purchase line(s) and "
+            "%s unmatched sale line(s)",
+            len(purchase_lines),
+            len(sale_lines))
+
     @classmethod
     def get_totals(cls):
         cursor = Transaction().connection.cursor()