diff --git a/line.py b/line.py
index 517bea2..8c7b862 100644
--- a/line.py
+++ b/line.py
@@ -150,10 +150,10 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
                 cashbook = Cashbook.browse([id_cashbook])[0]
 
         if isinstance(values, dict):
-            type_ = values.get('bookingtype', None)
+            type_ = values.get('bookingtype', getattr(line, 'bookingtype', None))
             quantity = values.get('quantity', None)
         else :
-            type_ = getattr(values, 'bookingtype', None)
+            type_ = getattr(values, 'bookingtype', getattr(line, 'bookingtype', None))
             quantity = getattr(values, 'quantity', None)
 
         if (type_ is not None) and (cashbook.feature == 'asset'):
@@ -170,6 +170,7 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
                         })
                 else :
                     raise ValueError('invalid "bookingtype"')
+
         return result
 
     @classmethod