diff --git a/modules/purchase_trade/purchase.py b/modules/purchase_trade/purchase.py
index b9433e2..1501a40 100755
--- a/modules/purchase_trade/purchase.py
+++ b/modules/purchase_trade/purchase.py
@@ -1031,7 +1031,10 @@ class Line(metaclass=PoolMeta):
 
     @classmethod
     def default_pricing_rule(cls):
-        Configuration = Pool().get('purchase_trade.configuration')
+        try:
+            Configuration = Pool().get('purchase_trade.configuration')
+        except KeyError:
+            return ''
         configurations = Configuration.search([], limit=1)
         if configurations:
             return configurations[0].pricing_rule or ''
diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index 3de8ca9..fb61cd7 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -751,7 +751,10 @@ class SaleLine(metaclass=PoolMeta):
 
     @classmethod
     def default_pricing_rule(cls):
-        Configuration = Pool().get('purchase_trade.configuration')
+        try:
+            Configuration = Pool().get('purchase_trade.configuration')
+        except KeyError:
+            return ''
         configurations = Configuration.search([], limit=1)
         if configurations:
             return configurations[0].pricing_rule or ''