diff --git a/modules/purchase_trade/duplicate.py b/modules/purchase_trade/duplicate.py
index 16a71e0..595233e 100644
--- a/modules/purchase_trade/duplicate.py
+++ b/modules/purchase_trade/duplicate.py
@@ -39,6 +39,8 @@ class TradeCustomDuplicateStart(ModelView):
         ('sale.sale', 'Sale'),
     ], readonly=True)
     duplicated_record_id = fields.Integer("Duplicated Record ID", readonly=True)
+    duplicate_pair_available = fields.Boolean(
+        "Duplicate Pair Available", readonly=True)
     party = fields.Many2One('party.party', "Counterparty", required=True)
     currency = fields.Many2One('currency.currency', "Currency", required=True)
     payment_term = fields.Many2One(
@@ -56,6 +58,7 @@ class TradeCustomDuplicateStart(ModelView):
         states={
             'invisible': ~Bool(Eval('create_matched_mirror')),
             'required': Bool(Eval('create_matched_mirror')),
+            'readonly': ~Bool(Eval('duplicate_pair_available')),
         })
     mirror_party = fields.Many2One('party.party', "Mirror Counterparty",
         states={
@@ -161,6 +164,33 @@ class TradeCustomDuplicate(Wizard):
     def _opposite_type(source_model):
         return 'Sale' if source_model == 'purchase.purchase' else 'Purchase'
 
+    @staticmethod
+    def _record_from_lot_report(record):
+        if getattr(record, '__name__', None) != 'lot.report':
+            return record
+        if getattr(record, 'r_purchase', None):
+            return record.r_purchase
+        if getattr(record, 'r_sale', None):
+            return record.r_sale
+        lot = (
+            getattr(record, 'r_lot_p', None)
+            or getattr(record, 'r_lot_s', None)
+            or getattr(record, 'r_lot_himself', None))
+        if lot:
+            line = getattr(lot, 'line', None)
+            if line and getattr(line, 'purchase', None):
+                return line.purchase
+            sale_line = getattr(lot, 'sale_line', None)
+            if sale_line and getattr(sale_line, 'sale', None):
+                return sale_line.sale
+        raise UserError(
+            "Custom duplicate could not find a purchase or sale from this "
+            "Lots Management line.")
+
+    @staticmethod
+    def _source_record(record):
+        return TradeCustomDuplicate._record_from_lot_report(record)
+
     @staticmethod
     def _reference_record(reference):
         if not reference:
@@ -172,15 +202,18 @@ class TradeCustomDuplicate(Wizard):
 
     def default_start(self, fields):
         if len(self.records) != 1:
-            raise UserError("Please select a single purchase or sale.")
+            raise UserError(
+                "Please select a single purchase, sale, or Lots Management "
+                "line.")
 
-        record = self.records[0]
+        record = self._source_record(self.records[0])
         source_model = self._source_model(record)
         line = self._trade_line(record)
         if not line:
             raise UserError("The selected contract has no trade line to duplicate.")
         matched_record = self._matched_counterpart_record(
             record, line, strict=False)
+        duplicate_pair_available = bool(matched_record)
         mirror_mode = 'duplicate_pair' if matched_record else 'new_mirror'
         mirror_defaults = self._mirror_defaults(
             record, line, mirror_mode, strict=False)
@@ -202,6 +235,7 @@ class TradeCustomDuplicate(Wizard):
             'clear_fees': False,
             'clear_pricing_components': False,
             'create_matched_mirror': False,
+            'duplicate_pair_available': duplicate_pair_available,
             'mirror_mode': mirror_mode,
             **mirror_defaults,
         }
@@ -748,7 +782,7 @@ class TradeCustomDuplicate(Wizard):
             ContractFactory.create_contracts([detail], type_=mirror_type, ct=ct)
 
     def transition_duplicate(self):
-        record = self.records[0]
+        record = self._source_record(self.records[0])
         options = self.start
         new_record = self._copy_contract(record, options)
         new_line = self._apply_line_options(new_record, options)
diff --git a/modules/purchase_trade/lot.xml b/modules/purchase_trade/lot.xml
index b8e0e29..0ad25e8 100755
--- a/modules/purchase_trade/lot.xml
+++ b/modules/purchase_trade/lot.xml
@@ -148,9 +148,19 @@ this repository contains the full copyright notices and license terms. -->
             <field name="model">lot.report,-1</field>
             <field name="action" ref="act_plan_transport"/>
         </record>
+        <record model="ir.action.wizard" id="act_lot_report_custom_duplicate">
+            <field name="name">Custom Duplicate</field>
+            <field name="wiz_name">trade.custom_duplicate</field>
+            <field name="model">lot.report</field>
+        </record>
+        <record model="ir.action.keyword" id="act_lot_report_custom_duplicate_keyword">
+            <field name="keyword">form_action</field>
+            <field name="model">lot.report,-1</field>
+            <field name="action" ref="act_lot_report_custom_duplicate"/>
+        </record>
 
         <record model="ir.ui.view" id="add_lot_view_form">
-            <field name="model">lot.add.lot</field>
+            <field name="model">lot.add.lot</field>
             <field name="type">form</field>
             <field name="name">lot_add_start_form</field>
         </record>
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index 6009c52..859a3bc 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -6324,6 +6324,123 @@ class PurchaseTradeTestCase(ModuleTestCase):
         self.assertEqual(values['mirror_unit_price'], Decimal('25'))
         self.assertEqual(values['mirror_price_type'], 'priced')
 
+    def test_custom_duplicate_starts_from_lot_report_purchase(self):
+        'custom duplicate can resolve a Lots Management row to its purchase'
+        purchase_party = SimpleNamespace(id=1)
+        purchase_currency = SimpleNamespace(id=4)
+        purchase_payment_term = SimpleNamespace(id=5)
+        purchase_incoterm = SimpleNamespace(id=6)
+        unit = SimpleNamespace(id=3)
+        line = SimpleNamespace(
+            __name__='purchase.line',
+            id=11,
+            type='line',
+            product=Mock(),
+            lots=[],
+            unit=unit,
+            quantity=Decimal('100'),
+            quantity_theorical=Decimal('100'),
+            unit_price=Decimal('25'),
+            price_type='priced',
+        )
+        purchase = SimpleNamespace(
+            __name__='purchase.purchase',
+            id=12,
+            lines=[line],
+            party=purchase_party,
+            currency=purchase_currency,
+            payment_term=purchase_payment_term,
+            incoterm=purchase_incoterm,
+            btb=None,
+        )
+        line.purchase = purchase
+        lot_report = SimpleNamespace(
+            __name__='lot.report',
+            r_purchase=purchase,
+            r_sale=None,
+            r_lot_p=None,
+            r_lot_s=None,
+            r_lot_himself=None,
+        )
+        wizard = duplicate_module.TradeCustomDuplicate()
+        wizard.records = [lot_report]
+
+        values = wizard.default_start(None)
+
+        self.assertEqual(values['source_model'], 'purchase.purchase')
+        self.assertEqual(values['source'], 'purchase.purchase,12')
+        self.assertFalse(values['duplicate_pair_available'])
+        self.assertEqual(values['mirror_mode'], 'new_mirror')
+
+    def test_custom_duplicate_lot_report_marks_pair_available(self):
+        'Lots Management custom duplicate enables pair mode when matched'
+        purchase_party = SimpleNamespace(id=1)
+        sale_party = SimpleNamespace(id=2)
+        unit = SimpleNamespace(id=3)
+        sale = SimpleNamespace(
+            party=sale_party,
+            currency=SimpleNamespace(id=30),
+            payment_term=SimpleNamespace(id=31),
+            incoterm=SimpleNamespace(id=32))
+        sale_line = SimpleNamespace(
+            id=20,
+            sale=sale,
+            unit=unit,
+            quantity=Decimal('100'),
+            quantity_theorical=Decimal('100'),
+            unit_price=Decimal('50'),
+            price_type='priced')
+        physical_lot = SimpleNamespace(
+            id=10,
+            lot_type='physic',
+            sale_line=sale_line)
+        line = SimpleNamespace(
+            __name__='purchase.line',
+            id=11,
+            type='line',
+            product=Mock(),
+            lots=[physical_lot],
+            unit=unit,
+            quantity=Decimal('100'),
+            quantity_theorical=Decimal('100'),
+            unit_price=Decimal('25'),
+            price_type='priced',
+        )
+        purchase = SimpleNamespace(
+            __name__='purchase.purchase',
+            id=12,
+            lines=[line],
+            party=purchase_party,
+            currency=SimpleNamespace(id=4),
+            payment_term=SimpleNamespace(id=5),
+            incoterm=SimpleNamespace(id=6),
+        )
+        lot_report = SimpleNamespace(
+            __name__='lot.report',
+            r_purchase=purchase,
+            r_sale=None,
+            r_lot_p=physical_lot,
+            r_lot_s=None,
+            r_lot_himself=None,
+        )
+
+        class FakeLotQt:
+            @classmethod
+            def search(cls, domain):
+                return []
+
+        pool = Mock()
+        pool.get.side_effect = lambda name: {'lot.qt': FakeLotQt}[name]
+        wizard = duplicate_module.TradeCustomDuplicate()
+        wizard.records = [lot_report]
+
+        with patch.object(duplicate_module, 'Pool', return_value=pool):
+            values = wizard.default_start(None)
+
+        self.assertTrue(values['duplicate_pair_available'])
+        self.assertEqual(values['mirror_mode'], 'duplicate_pair')
+        self.assertEqual(values['mirror_party'], sale_party.id)
+
     def test_custom_duplicate_mirror_mode_change_refreshes_source_defaults(self):
         'changing mirror mode refreshes mirror fields from the source contract'
         purchase_party = SimpleNamespace(id=1)
diff --git a/modules/purchase_trade/view/trade_custom_duplicate_start_form.xml b/modules/purchase_trade/view/trade_custom_duplicate_start_form.xml
index 9261d63..97e3dba 100644
--- a/modules/purchase_trade/view/trade_custom_duplicate_start_form.xml
+++ b/modules/purchase_trade/view/trade_custom_duplicate_start_form.xml
@@ -48,4 +48,5 @@
     <field name="mirror_clear_pricing_components"/>
     <field name="source" invisible="1"/>
     <field name="duplicated_record_id" invisible="1"/>
+    <field name="duplicate_pair_available" invisible="1"/>
 </form>