diff --git a/modules/purchase_trade/stock.py b/modules/purchase_trade/stock.py
index 8386f94..35bcda9 100755
--- a/modules/purchase_trade/stock.py
+++ b/modules/purchase_trade/stock.py
@@ -846,8 +846,8 @@ class ShipmentIn(metaclass=PoolMeta):
     add_invoice = fields.Boolean("Add invoice")
     returned_id = fields.Char("Returned ID")
     result = fields.Char("Result",readonly=True)
-    sale_invoice_numbers = fields.Function(
-        fields.Char("Sale Invoice"), 'get_sale_invoice_numbers')
+    sale_invoice_ref = fields.Function(
+        fields.Char("Sale invoice ref."), 'get_sale_invoice_ref')
     agent = fields.Many2One('party.party',"Booking Agent")
     service_order_key = fields.Integer("Service Order Key")
 
@@ -3054,35 +3054,41 @@ class ShipmentIn(metaclass=PoolMeta):
     def get_sh(self, name):
         return self.id
 
-    def get_sale_invoice_numbers(self, name=None):
-        invoices = []
+    def get_sale_invoice_ref(self, name=None):
+        invoice_ref = self._sale_invoice_ref_from_instructions()
+        if invoice_ref:
+            return invoice_ref
+        return self._sale_invoice_ref_from_fintrade()
+
+    def _sale_invoice_ref_from_instructions(self):
+        instructions = self.html_to_text(self.instructions or '')
+        match = re.search(
+            r'Invoice\s+Nb:\s*([^|\r\n]+)', instructions, re.IGNORECASE)
+        if match:
+            return match.group(1).strip()
+
+    def _sale_invoice_ref_from_fintrade(self):
+        if not self.reference:
+            return None
+        try:
+            booking_number = int(self.reference)
+        except (TypeError, ValueError):
+            return None
+        t = Table('freight_booking_lots')
+        cursor = Transaction().connection.cursor()
+        query = t.select(
+            t.SALE_INVOICE,
+            where=(t.BOOKING_NUMBER == booking_number),
+            group_by=[t.SALE_INVOICE])
+        cursor.execute(*query)
+        refs = []
         seen = set()
-
-        def add_invoice(invoice):
-            invoice_id = getattr(invoice, 'id', None)
-            key = invoice_id or id(invoice)
-            if not invoice or key in seen:
-                return
-            seen.add(key)
-            invoices.append(
-                getattr(invoice, 'rec_name', None)
-                or getattr(invoice, 'number', None)
-                or getattr(invoice, 'reference', None)
-                or str(invoice_id or ''))
-
-        for lotqt in self.lotqt or []:
-            lots = [
-                getattr(lotqt, 'lot_p', None),
-                getattr(lotqt, 'lot_s', None),
-                ]
-            for lot in lots:
-                if not lot or getattr(lot, 'lot_type', None) != 'physic':
-                    continue
-                invoice_line = (
-                    getattr(lot, 'sale_invoice_line', None)
-                    or getattr(lot, 'sale_invoice_line_prov', None))
-                add_invoice(getattr(invoice_line, 'invoice', None))
-        return ', '.join(filter(None, invoices))
+        for row in cursor.fetchall():
+            ref = str(row[0] or '').strip()
+            if ref and ref not in seen:
+                refs.append(ref)
+                seen.add(ref)
+        return ', '.join(refs)
 
     @classmethod
     def default_transport_type(cls):
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index 33fee0e..e7ae0e4 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -7417,34 +7417,22 @@ description</t></is></c>
                 shipment.report_insurance_issue_place_and_date,
                 'GENEVA, 06-04-2026')
 
-    def test_shipment_sale_invoice_numbers_use_physical_lot_invoices(self):
-        'shipment tree helper lists sale invoices linked to physical lots'
-        final_invoice = SimpleNamespace(id=1, rec_name='SINV-001')
-        provisional_invoice = SimpleNamespace(id=2, rec_name='SPRO-002')
-        final_line = SimpleNamespace(invoice=final_invoice)
-        provisional_line = SimpleNamespace(invoice=provisional_invoice)
-        physical_final = SimpleNamespace(
-            lot_type='physic',
-            sale_invoice_line=final_line,
-            sale_invoice_line_prov=provisional_line)
-        physical_provisional = SimpleNamespace(
-            lot_type='physic',
-            sale_invoice_line=None,
-            sale_invoice_line_prov=provisional_line)
-        virtual = SimpleNamespace(
-            lot_type='virtual',
-            sale_invoice_line=SimpleNamespace(
-                invoice=SimpleNamespace(id=3, rec_name='IGNORED')),
-            sale_invoice_line_prov=None)
-        shipment = SimpleNamespace(lotqt=[
-            SimpleNamespace(lot_p=physical_final, lot_s=virtual),
-            SimpleNamespace(lot_p=physical_provisional, lot_s=None),
-            SimpleNamespace(lot_p=physical_final, lot_s=None),
-            ])
+    def test_shipment_sale_invoice_ref_uses_weight_report_message(self):
+        'shipment tree helper reads the sale invoice ref from instructions'
+        shipment = SimpleNamespace(
+            instructions=(
+                '<p><strong>Customer:</strong> CLIENT | '
+                '<strong>Invoice Nb:</strong> 4661 | '
+                '<strong>Invoice Date:</strong> 2026-07-28</p>'),
+            html_to_text=Mock(side_effect=lambda html_content:
+                stock_module.ShipmentIn.html_to_text(
+                    SimpleNamespace(), html_content)),
+            _sale_invoice_ref_from_fintrade=Mock(return_value='IGNORED'))
 
         self.assertEqual(
-            stock_module.ShipmentIn.get_sale_invoice_numbers(shipment),
-            'SINV-001, SPRO-002')
+            stock_module.ShipmentIn.get_sale_invoice_ref(shipment),
+            '4661')
+        shipment._sale_invoice_ref_from_fintrade.assert_not_called()
 
     def test_shipment_insurance_amount_fallback_uses_lot_and_incoming_moves(self):
         'insurance amount falls back to lot unit price and shipment quantities'
diff --git a/modules/purchase_trade/view/shipment_in_tree.xml b/modules/purchase_trade/view/shipment_in_tree.xml
index b034f17..49c51e9 100644
--- a/modules/purchase_trade/view/shipment_in_tree.xml
+++ b/modules/purchase_trade/view/shipment_in_tree.xml
@@ -9,7 +9,7 @@ this repository contains the full copyright notices and license terms. -->
     <xpath expr="/tree/field[@name='reference']" position="after">
         <field name="returned_id" optional="1"/>
         <field name="result" optional="1"/>
-        <field name="sale_invoice_numbers" optional="1"/>
+        <field name="sale_invoice_ref" optional="1"/>
         <field name="vessel" string="Vessel name" optional="1"/>
         <field name="list_from_locations" optional="1"/>
         <field name="list_to_locations" optional="1"/>