diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index 5c25f61..fc6c829 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -339,7 +339,7 @@ class Sale(metaclass=PoolMeta):
         for sale in sales:
             for line in sale.lines:
                 if not line.quantity_theorical and line.quantity > 0:
-                    line.quantity_theorical = line.quantity
+                    line.quantity_theorical = Decimal(str(line.quantity)).quantize(Decimal("0.00001"))
                     Line.save([line])
                     
                 if line.lots: