diff --git a/murano/dsl/class_loader.py b/murano/dsl/class_loader.py
index 05264b20..d16a1085 100644
--- a/murano/dsl/class_loader.py
+++ b/murano/dsl/class_loader.py
@@ -71,7 +71,7 @@ class MuranoClassLoader(object):
 
         properties = data.get('Properties') or {}
         for property_name, property_spec in properties.iteritems():
-            spec = typespec.PropertySpec(property_spec)
+            spec = typespec.PropertySpec(property_spec, type_obj)
             type_obj.add_property(property_name, spec)
 
         methods = data.get('Methods') or data.get('Workflow') or {}
diff --git a/murano/dsl/murano_method.py b/murano/dsl/murano_method.py
index d96ce484..0aac9ba1 100644
--- a/murano/dsl/murano_method.py
+++ b/murano/dsl/murano_method.py
@@ -68,7 +68,7 @@ class MuranoMethod(dsl_types.MuranoMethod):
                     raise ValueError()
                 name = record.keys()[0]
                 self._arguments_scheme[name] = typespec.ArgumentSpec(
-                    record[name])
+                    record[name], self.murano_class)
         self._yaql_function_definition = \
             yaql_integration.build_wrapper_function_definition(self)
 
diff --git a/murano/dsl/murano_object.py b/murano/dsl/murano_object.py
index 512510fa..30716db5 100644
--- a/murano/dsl/murano_object.py
+++ b/murano/dsl/murano_object.py
@@ -26,7 +26,7 @@ class MuranoObject(dsl_types.MuranoObject):
                  name=None, known_classes=None, defaults=None, this=None):
         if known_classes is None:
             known_classes = {}
-        self.__owner = owner
+        self.__owner = owner.real_this if owner else None
         self.__object_id = object_id or helpers.generate_id()
         self.__type = murano_class
         self.__properties = {}
@@ -222,7 +222,7 @@ class MuranoObject(dsl_types.MuranoObject):
 
                 obj = self.cast(mc)
                 values_to_assign.append((obj, spec.validate(
-                    value, context or self.context, self.real_this,
+                    value, self.real_this,
                     self.real_this, default=default)))
             for obj, value in values_to_assign:
                 obj.__properties[name] = value
@@ -240,7 +240,7 @@ class MuranoObject(dsl_types.MuranoObject):
                 return parent.cast(type)
             except TypeError:
                 continue
-        raise TypeError('Cannot cast')
+        raise TypeError('Cannot cast {0} to {1}'.format(self, type))
 
     def __repr__(self):
         return '<{0} {1} ({2})>'.format(
diff --git a/murano/dsl/typespec.py b/murano/dsl/typespec.py
index bbef3d7d..a0b0f448 100644
--- a/murano/dsl/typespec.py
+++ b/murano/dsl/typespec.py
@@ -12,6 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import weakref
+
 from murano.dsl import exceptions
 from murano.dsl import type_scheme
 
@@ -28,7 +30,8 @@ class PropertyUsages(object):
 
 
 class Spec(object):
-    def __init__(self, declaration):
+    def __init__(self, declaration, container_class):
+        self._container_class = weakref.ref(container_class)
         self._contract = type_scheme.TypeScheme(declaration['Contract'])
         self._usage = declaration.get('Usage') or 'In'
         self._default = declaration.get('Default')
@@ -38,10 +41,12 @@ class Spec(object):
                 'Unknown type {0}. Must be one of ({1})'.format(
                     self._usage, ', '.join(PropertyUsages.All)))
 
-    def validate(self, value, context, this, owner, default=None):
+    def validate(self, value, this, owner, default=None):
         if default is None:
             default = self.default
-        return self._contract(value, context, this, owner, default)
+        return self._contract(
+            value, this.cast(self._container_class()).context,
+            this, owner, default)
 
     @property
     def default(self):
diff --git a/murano/dsl/yaql_integration.py b/murano/dsl/yaql_integration.py
index e5d0ab2d..38450794 100644
--- a/murano/dsl/yaql_integration.py
+++ b/murano/dsl/yaql_integration.py
@@ -61,7 +61,7 @@ class ContractedValue(yaqltypes.GenericType):
             True, None,
             lambda value, sender, context, *args, **kwargs:
                 self._value_spec.validate(
-                    value, sender.context, helpers.get_this(context),
+                    value, sender.real_this,
                     context[constants.CTX_ARGUMENT_OWNER]))
 
     def convert(self, value, *args, **kwargs):