--- a/trytond/trytond/modules/product/product.py
+++ b/trytond/trytond/modules/product/product.py
@@ -165,9 +165,9 @@ class Template(

 class TemplateFunction(fields.Function):

-    def __init__(self, field):
+    def __init__(self, field, searcher):
         super(TemplateFunction, self).__init__(
-            field, 'get_template', searcher='search_template')
+            field, 'get_template', searcher=searcher)
         # Disable on_change as it is managed by on_change_template
         self.on_change = set()
         self.on_change_with = set()
@@ -176,7 +176,7 @@ class TemplateFunction(fields.Function):
         return TemplateFunction(copy.copy(self._field))

     def __deepcopy__(self, memo):
-        return TemplateFunction(copy.deepcopy(self._field, memo))
+        return TemplateFunction(copy.deepcopy(self._field, memo),self.searcher)

     @staticmethod
     def order(name):
@@ -246,7 +246,14 @@ class Product(
                 continue
             field = getattr(cls, attr, None)
             if not field or isinstance(field, TemplateFunction):
-                setattr(cls, attr, TemplateFunction(copy.deepcopy(tfield)))
+                if (isinstance(tfield, fields.Function)
+                        and not tfield.searcher
+                        and not hasattr(Template, 'domain_' + attr)):
+                    searcher = None
+                else:
+                    searcher = 'search_template'
+                setattr(cls, attr, TemplateFunction(copy.deepcopy(tfield),
+                        searcher))
                 order_method = getattr(cls, 'order_%s' % attr, None)
                 if (not order_method
                         and not isinstance(tfield, (