diff --git a/product.py b/product.py
index 5a7037a82d..da86d89f5b 100644
--- a/product.py
+++ b/product.py
@@ -7,8 +7,8 @@ from trytond.pyson import Eval
 
 class ProductBom(metaclass=PoolMeta):
     __name__ = 'product.product-production.bom'
-    routing = fields.Many2One('production.routing', 'Routing',
-        ondelete='CASCADE', select=True,
+    routing = fields.Many2One(
+        'production.routing', "Routing", ondelete='CASCADE',
         domain=[
             ('boms', '=', Eval('bom', 0)),
             ])
diff --git a/routing.py b/routing.py
index f78ad7e0ba..53adc2ad5e 100644
--- a/routing.py
+++ b/routing.py
@@ -43,6 +43,5 @@ class RoutingStep(sequence_ordered(), ModelSQL, ModelView):
 class Routing_BOM(ModelSQL):
     'Routing - BOM'
     __name__ = 'production.routing-production.bom'
-    routing = fields.Many2One('production.routing', 'Routing', required=True,
-        select=True)
-    bom = fields.Many2One('production.bom', 'BOM', required=True, select=True)
+    routing = fields.Many2One('production.routing', 'Routing', required=True)
+    bom = fields.Many2One('production.bom', 'BOM', required=True)