diff --git a/modules/purchase_trade/ctrm_reporting.py b/modules/purchase_trade/ctrm_reporting.py
index 045505c..44e7005 100644
--- a/modules/purchase_trade/ctrm_reporting.py
+++ b/modules/purchase_trade/ctrm_reporting.py
@@ -1237,9 +1237,9 @@ class CTRMContractPerformance(ModelSQL, ModelView):
             purchase_line.tol_max, purchase.tol_max, 0)
         purchase_actual_quantity = Sum(Coalesce(lot.lot_qt, 0))
         purchase_min_quantity = purchase_contract_quantity * (
-            1 - (purchase_tolerance_min / 100))
+            Literal(1) - (purchase_tolerance_min / Literal(100)))
         purchase_max_quantity = purchase_contract_quantity * (
-            1 + (purchase_tolerance_max / 100))
+            Literal(1) + (purchase_tolerance_max / Literal(100)))
         purchase_status = Case(
             (purchase_actual_quantity < purchase_min_quantity, 'under'),
             (purchase_actual_quantity > purchase_max_quantity, 'over'),
@@ -1251,9 +1251,9 @@ class CTRMContractPerformance(ModelSQL, ModelView):
         sale_tolerance_max = Coalesce(sale_line.tol_max, sale.tol_max, 0)
         sale_actual_quantity = Sum(Coalesce(lot.lot_qt, 0))
         sale_min_quantity = sale_contract_quantity * (
-            1 - (sale_tolerance_min / 100))
+            Literal(1) - (sale_tolerance_min / Literal(100)))
         sale_max_quantity = sale_contract_quantity * (
-            1 + (sale_tolerance_max / 100))
+            Literal(1) + (sale_tolerance_max / Literal(100)))
         sale_status = Case(
             (sale_actual_quantity < sale_min_quantity, 'under'),
             (sale_actual_quantity > sale_max_quantity, 'over'),