diff --git a/modules/purchase_trade/lot.py b/modules/purchase_trade/lot.py
index c35bfcd..61179b7 100755
--- a/modules/purchase_trade/lot.py
+++ b/modules/purchase_trade/lot.py
@@ -2719,12 +2719,20 @@ class LotInvoice(Wizard):
             val_s['lot_price'] = lot.lot_price_sale
             val_s['lot_amount'] = lot.get_current_quantity_converted() * lot.lot_price_sale if lot.lot_price_sale else Decimal(0)
             val_s['lot_diff_quantity'] = 0
-            val_s['lot_diff_price'] = 0
-            val_s['lot_diff_amount'] = 0
-            if lot.sale_invoice_line_prov:
-                val_s['lot_diff_quantity'] = val_s['lot_quantity'] - Decimal(lot.sale_invoice_line_prov.quantity)
-                val_s['lot_diff_price'] = val_s['lot_price'] - Decimal(lot.sale_invoice_line_prov.unit_price)
-                val_s['lot_diff_amount'] = val_s['lot_amount'] - Decimal(lot.sale_invoice_line_prov.amount)
+            val_s['lot_diff_price'] = 0
+            val_s['lot_diff_amount'] = 0
+            if lot.sale_invoice_line_prov:
+                provisional_quantity = (
+                    Decimal(lot.sale_invoice_line_prov.quantity)
+                    - Decimal(str(lot.sale_invoice_padding or 0)))
+                val_s['lot_diff_quantity'] = (
+                    val_s['lot_quantity'] - provisional_quantity)
+                val_s['lot_diff_price'] = val_s['lot_price'] - Decimal(lot.sale_invoice_line_prov.unit_price)
+                provisional_amount = (
+                    provisional_quantity
+                    * Decimal(lot.sale_invoice_line_prov.unit_price))
+                val_s['lot_diff_amount'] = (
+                    val_s['lot_amount'] - provisional_amount)
             val_s['lot_currency'] = lot.lot_price_ct_symbol_sale
             val_s['lot_unit'] = sale_line.unit.id if sale_line else None
             lot_s.append(val_s)