diff --git a/modules/purchase_trade/__init__.py b/modules/purchase_trade/__init__.py
index d9dd13b..ffd2511 100755
--- a/modules/purchase_trade/__init__.py
+++ b/modules/purchase_trade/__init__.py
@@ -185,12 +185,13 @@ def register():
         derivative.DerivativeReportContext,
         fee.FeeReport,
         fee.FeeContext,
-        forex.ForexCoverPhysicalContract,
-        forex.PForex,
-        forex.ForexBI,
-        purchase.PnlBI,
-        purchase.PositionBI,
-        stock.Move,
+        forex.ForexCoverPhysicalContract,
+        forex.PForex,
+        forex.ForexBI,
+        purchase.PurchasePnlGraph,
+        purchase.PnlBI,
+        purchase.PositionBI,
+        stock.Move,
         stock.Location,
         stock.InvoiceLine,
         stock.ShipmentIn,
diff --git a/modules/purchase_trade/purchase.py b/modules/purchase_trade/purchase.py
index acf77b6..b8be77a 100755
--- a/modules/purchase_trade/purchase.py
+++ b/modules/purchase_trade/purchase.py
@@ -11,7 +11,7 @@ from trytond.tools import (cursor_dict, is_full_text, lstrip_wildcard)
 from trytond.transaction import Transaction, inactive_records
 from decimal import getcontext, Decimal, ROUND_HALF_UP
 from sql.aggregate import Count, Max, Min, Sum, Avg, BoolOr
-from sql.conditionals import Case
+from sql.conditionals import Case, Coalesce
 from sql import Column, Literal
 from sql.functions import CurrentTimestamp, DateTrunc, Abs
 from trytond.wizard import Button, StateTransition, StateView, Wizard, StateAction
@@ -370,11 +370,13 @@ class Purchase(metaclass=PoolMeta):
     wb = fields.Many2One('purchase.weight.basis',"Weight basis", required=True)
     association = fields.Many2One('purchase.association',"Association", required=True,states={'invisible': Eval('company_visible'),})
     crop = fields.Many2One('purchase.crop',"Crop",states={'invisible': Eval('company_visible'),})
-    pnl = fields.One2Many('valuation.valuation.dyn', 'r_purchase', 'Pnl',states={'invisible': ~Eval('group_pnl'),})
-    pnl_ = fields.One2Many('valuation.valuation.line', 'purchase', 'Pnl',states={'invisible': Eval('group_pnl'),}) 
-    derivatives = fields.One2Many('derivative.derivative', 'purchase', 'Derivative')
-    plans = fields.One2Many('workflow.plan','purchase',"Execution plans")
-    forex = fields.One2Many('forex.cover.physical.contract','contract',"Forex",readonly=True)
+    pnl = fields.One2Many('valuation.valuation.dyn', 'r_purchase', 'Pnl',states={'invisible': ~Eval('group_pnl'),})
+    pnl_ = fields.One2Many('valuation.valuation.line', 'purchase', 'Pnl',states={'invisible': Eval('group_pnl'),})
+    pnl_graph = fields.One2Many(
+        'purchase.pnl.graph', 'purchase', 'Pnl graph')
+    derivatives = fields.One2Many('derivative.derivative', 'purchase', 'Derivative')
+    plans = fields.One2Many('workflow.plan','purchase',"Execution plans")
+    forex = fields.One2Many('forex.cover.physical.contract','contract',"Forex",readonly=True)
     plan = fields.Many2One('workflow.plan',"Name")
     estimated_date = fields.One2Many('pricing.estimated','purchase',"Estimated date")
     group_pnl = fields.Boolean("Group Pnl")
@@ -3319,9 +3321,9 @@ class GoToBi(Wizard):
         action['url'] = config.bi + '/dashboard/6-pnl?lot=&product=&purchase='+ ct_number + '&sale='
         return action, {}
 
-class PurchaseAllocationsWizard(Wizard):
-    'Open Allocations report from Purchase without modal'
-    __name__ = 'purchase.allocations.wizard'
+class PurchaseAllocationsWizard(Wizard):
+    'Open Allocations report from Purchase without modal'
+    __name__ = 'purchase.allocations.wizard'
 
     start_state = 'open_report'
 
@@ -3334,11 +3336,45 @@ class PurchaseAllocationsWizard(Wizard):
         action['context_model'] = 'lot.context'
         action['pyson_context'] = PYSONEncoder().encode({
                 'purchase': purchase_id,
-                })
-        return action, {}
-
-class PurchaseInvoiceReport(
-        ModelSQL, ModelView):
+        })
+        return action, {}
+
+
+class PurchasePnlGraph(ModelSQL, ModelView):
+    "Purchase Pnl graph"
+    __name__ = 'purchase.pnl.graph'
+
+    purchase = fields.Many2One('purchase.purchase', "Purchase")
+    valuation_date = fields.Date("Valuation Date")
+    pnl = fields.Numeric("Pnl", digits=(16, 2))
+    mtm = fields.Numeric("Mtm", digits=(16, 2))
+
+    @classmethod
+    def __setup__(cls):
+        super().__setup__()
+        cls._order.insert(0, ('valuation_date', 'ASC'))
+
+    @classmethod
+    def table_query(cls):
+        Valuation = Pool().get('valuation.valuation')
+        val = Valuation.__table__()
+        return val.select(
+            Literal(0).as_('create_uid'),
+            CurrentTimestamp().as_('create_date'),
+            Literal(None).as_('write_uid'),
+            Literal(None).as_('write_date'),
+            Max(val.id).as_('id'),
+            val.purchase.as_('purchase'),
+            val.date.as_('valuation_date'),
+            Sum(Coalesce(val.pnl, 0)).as_('pnl'),
+            Sum(Coalesce(val.mtm, 0)).as_('mtm'),
+            where=(val.purchase != None),
+            group_by=[val.purchase, val.date],
+            order_by=[val.date.asc])
+
+
+class PurchaseInvoiceReport(
+        ModelSQL, ModelView):
     "Purchase invoices"
     __name__ = 'purchase.invoice.report'
     r_supplier = fields.Many2One('party.party',"Supplier")
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index 31b795c..c7baf95 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -2,6 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 
 import datetime
+from pathlib import Path
 from contextlib import nullcontext
 from decimal import Decimal
 from types import SimpleNamespace
@@ -5252,6 +5253,24 @@ class PurchaseTradeTestCase(ModuleTestCase):
         self.assertEqual(
             ShipmentIn.operator.domain, [('categories.name', '=', 'OPERATOR')])
 
+    def test_purchase_form_has_pnl_graph_tab_after_pnl(self):
+        'purchase form exposes a rich graph for historical PnL and MTM'
+        path = Path('modules/purchase_trade/view/purchase_form.xml')
+        root = ElementTree.parse(path).getroot()
+        pages = root.findall(".//xpath[@expr=\"/form/notebook/page[@id='info']\"]//page")
+        page_ids = [page.get('id') for page in pages]
+        pnl_index = page_ids.index('pnl')
+
+        self.assertEqual(page_ids[pnl_index + 1], 'pnl_graph')
+
+        graph_field = pages[pnl_index + 1].find("field[@name='pnl_graph']")
+        self.assertIsNotNone(graph_field)
+        self.assertEqual(graph_field.get('widget'), 'rich_graph')
+        self.assertEqual(graph_field.get('date_field'), 'valuation_date')
+        self.assertEqual(graph_field.get('series'), 'pnl,mtm')
+        self.assertEqual(graph_field.get('labels'), 'pnl:Pnl,mtm:Mtm')
+        self.assertIsNone(graph_field.get('hidden_series'))
+
     def test_shipment_in_pnl_lines_use_physical_and_open_lots(self):
         'shipment PnL uses valuation lines from physical and open lot links'
         ShipmentIn = Pool().get('stock.shipment.in')
diff --git a/modules/purchase_trade/view/purchase_form.xml b/modules/purchase_trade/view/purchase_form.xml
index 5c7f729..79841eb 100755
--- a/modules/purchase_trade/view/purchase_form.xml
+++ b/modules/purchase_trade/view/purchase_form.xml
@@ -149,13 +149,23 @@ this repository contains the full copyright notices and license terms. -->
         <page string="Forex" col="4" id="fo">
             <field name="forex" mode="tree" view_ids="purchase_trade.view_forex_cover_physical_contract_tree2"/>
         </page>
-        <page string="Pnl" col="4" >
+        <page string="Pnl" col="4" id="pnl">
             <label name="group_pnl"/>
             <field name="group_pnl" colspan="1"/>
             <newline/>
             <field name="pnl_" mode="tree,graph,graph" view_ids="purchase_trade.valuation_view_tree_sequence3,purchase_trade.valuation_view_graph,purchase_trade.valuation_view_graph2" height="450" colspan="4"/>
             <field name="pnl" mode="tree" view_ids="purchase_trade.valuation_view_tree_sequence4" height="450" colspan="4"/>
         </page>
+        <page string="Pnl graph" col="4" id="pnl_graph">
+            <field name="pnl_graph"
+                widget="rich_graph"
+                date_field="valuation_date"
+                series="pnl,mtm"
+                labels="pnl:Pnl,mtm:Mtm"
+                colors="pnl:#00b894,mtm:#8b5cf6"
+                height="360"
+                colspan="4"/>
+        </page>
     </xpath>
     <xpath expr="/form/notebook/page[@id='info']/label[@name='invoice_party']" position="before">
         <field name="bank_accounts" colspan="4" invisible="1"/>