diff --git a/modules/purchase_trade/invoice.py b/modules/purchase_trade/invoice.py
index ca50980..ab445ea 100644
--- a/modules/purchase_trade/invoice.py
+++ b/modules/purchase_trade/invoice.py
@@ -105,6 +105,39 @@ class InvoiceLineLotWeight(ModelSQL, ModelView):
 class Invoice(metaclass=PoolMeta):
     __name__ = 'account.invoice'
 
+    @classmethod
+    def _sale_padding_lots_to_clear_on_delete(cls, invoices):
+        lots = {}
+        for invoice in invoices:
+            if (getattr(invoice, 'type', None) != 'out'
+                    or getattr(invoice, 'reference', None) != 'Provisional'
+                    or getattr(invoice, 'number', None)):
+                continue
+            invoice_id = getattr(invoice, 'id', None)
+            for line in getattr(invoice, 'lines', None) or []:
+                if (getattr(line, 'type', None) != 'line'
+                        or getattr(line, 'description', None) != 'Pro forma'):
+                    continue
+                lot = getattr(line, 'lot', None)
+                if not lot:
+                    continue
+                provisional_line = getattr(lot, 'sale_invoice_line_prov', None)
+                provisional_invoice = getattr(provisional_line, 'invoice', None)
+                if (invoice_id and provisional_invoice
+                        and getattr(provisional_invoice, 'id', None) != invoice_id):
+                    continue
+                if Decimal(str(getattr(lot, 'sale_invoice_padding', 0) or 0)):
+                    lots[getattr(lot, 'id', id(lot))] = lot
+        return list(lots.values())
+
+    @classmethod
+    def delete(cls, invoices):
+        Lot = Pool().get('lot.lot')
+        padding_lots = cls._sale_padding_lots_to_clear_on_delete(invoices)
+        super().delete(invoices)
+        if padding_lots:
+            Lot.write(padding_lots, {'sale_invoice_padding': Decimal(0)})
+
     def do_lot_invoicing(self):
         super().do_lot_invoicing()
         self._create_lot_weight_snapshots()
diff --git a/modules/purchase_trade/lot.py b/modules/purchase_trade/lot.py
index 4d3099c..9b0f79e 100755
--- a/modules/purchase_trade/lot.py
+++ b/modules/purchase_trade/lot.py
@@ -4869,7 +4869,7 @@ class LotInvoice(Wizard):
                         break
         if not invoice_line:
             raise UserError("No invoice line was generated from the selected lots.")
-        self._invoice_selected_fees()
+        self._invoiced_fee_count = self._invoice_selected_fees()
         self.message.invoice = invoice_line.invoice
 
         return 'message'
@@ -4895,6 +4895,7 @@ class LotInvoice(Wizard):
             fees.append(fee)
         if fees:
             Fee.invoice(fees)
+        return len(fees)
 
     @classmethod
     def _split_sale_padding(cls, padding, lots):
@@ -4913,10 +4914,16 @@ class LotInvoice(Wizard):
             lot.sale_invoice_padding = padding_by_lot.get(lot.id, Decimal(0))
         Lot.save(lots)
 
-    def default_message(self, fields):
-        return {
-            'message': 'The invoice has been successfully created.',
-        }
+    def default_message(self, fields):
+        fee_count = getattr(self, '_invoiced_fee_count', 0)
+        message = 'The invoice has been successfully created.'
+        if fee_count:
+            message += (
+                ' %s selected fee invoice(s) have also been processed.'
+                % fee_count)
+        return {
+            'message': message,
+        }
     
     def do_see_invoice(self, action):
         action['views'].reverse()  # pour ouvrir en form directement
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index ebd2625..8ace310 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -7914,6 +7914,41 @@ class PurchaseTradeTestCase(ModuleTestCase):
         self.assertEqual(invoice.report_commission_note_total_display, '24.60')
         fee.get_amount.assert_not_called()
 
+    def test_sale_provisional_invoice_delete_collects_padding_lots(self):
+        'deleting a draft sale provisional invoice clears its lot padding'
+        Invoice = Pool().get('account.invoice')
+
+        invoice = SimpleNamespace(
+            id=10,
+            type='out',
+            reference='Provisional',
+            number=None,
+            lines=[])
+        provisional_line = SimpleNamespace(invoice=invoice)
+        lot = SimpleNamespace(
+            id=20,
+            sale_invoice_padding=Decimal('2'),
+            sale_invoice_line_prov=provisional_line)
+        invoice.lines = [
+            SimpleNamespace(
+                type='line',
+                description='Pro forma',
+                lot=lot)]
+
+        self.assertEqual(
+            Invoice._sale_padding_lots_to_clear_on_delete([invoice]),
+            [lot])
+
+    def test_lot_invoice_message_mentions_processed_fees(self):
+        'lot invoice success message mentions selected fee invoicing'
+        wizard = lot_module.LotInvoice()
+        wizard._invoiced_fee_count = 2
+
+        self.assertEqual(
+            wizard.default_message(None)['message'],
+            'The invoice has been successfully created. '
+            '2 selected fee invoice(s) have also been processed.')
+
     def test_invoice_report_net_sums_signed_invoice_lines(self):
         'invoice report net uses the signed differential from invoice lines'
         Invoice = Pool().get('account.invoice')