diff --git a/sdk/managementgroups/azure-mgmt-managementgroups/_meta.json b/sdk/managementgroups/azure-mgmt-managementgroups/_meta.json
index dd31d1077c15..8f7eeeccac79 100644
--- a/sdk/managementgroups/azure-mgmt-managementgroups/_meta.json
+++ b/sdk/managementgroups/azure-mgmt-managementgroups/_meta.json
@@ -1,11 +1,11 @@
 {
-  "autorest": "3.4.2",
+  "autorest": "3.4.5",
   "use": [
-    "@autorest/python@5.8.0",
-    "@autorest/modelerfour@4.19.1"
+    "@autorest/python@5.8.4",
+    "@autorest/modelerfour@4.19.2"
   ],
-  "commit": "e5bdbb00cf31e34dfaffe74432b80a110f86e06a",
+  "commit": "6ba37b7279bbd0d69042743246780cc3af9257b9",
   "repository_url": "https://github.com/Azure/azure-rest-api-specs",
-  "autorest_command": "autorest specification/managementgroups/resource-manager/readme.md --multiapi --python --python-mode=update --python-sdks-folder=/home/vsts/work/1/s/azure-sdk-for-python/sdk --track2 --use=@autorest/python@5.8.0 --use=@autorest/modelerfour@4.19.1 --version=3.4.2",
+  "autorest_command": "autorest specification/managementgroups/resource-manager/readme.md --multiapi --python --python-mode=update --python-sdks-folder=/home/vsts/work/1/s/azure-sdk-for-python/sdk --track2 --use=@autorest/python@5.8.4 --use=@autorest/modelerfour@4.19.2 --version=3.4.5",
   "readme": "specification/managementgroups/resource-manager/readme.md"
 }
\ No newline at end of file
diff --git a/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/_version.py b/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/_version.py
index c47f66669f1b..fe0d5a0b414c 100644
--- a/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/_version.py
+++ b/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/_version.py
@@ -6,4 +6,4 @@
 # Changes may cause incorrect behavior and will be lost if the code is regenerated.
 # --------------------------------------------------------------------------
 
-VERSION = "1.0.0"
+VERSION = "2019-05-01T00:00:00.000Z"
diff --git a/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/models/_models.py b/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/models/_models.py
index 5baa1bc0c0cf..1b707a2987ce 100644
--- a/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/models/_models.py
+++ b/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/models/_models.py
@@ -65,32 +65,26 @@ def __init__(
 class CheckNameAvailabilityRequest(msrest.serialization.Model):
     """Management group name availability check parameters.
 
-    Variables are only populated by the server, and will be ignored when sending a request.
-
     :param name: the name to check for availability.
     :type name: str
-    :ivar type: fully qualified resource type which includes provider namespace. Default value:
-     "Microsoft.Management/managementGroups".
-    :vartype type: str
+    :param type: fully qualified resource type which includes provider namespace. The only
+     acceptable values to pass in are None and "Microsoft.Management/managementGroups". The default
+     value is None.
+    :type type: str
     """
 
-    _validation = {
-        'type': {'constant': True},
-    }
-
     _attribute_map = {
         'name': {'key': 'name', 'type': 'str'},
         'type': {'key': 'type', 'type': 'str'},
     }
 
-    type = "Microsoft.Management/managementGroups"
-
     def __init__(
         self,
         **kwargs
     ):
         super(CheckNameAvailabilityRequest, self).__init__(**kwargs)
         self.name = kwargs.get('name', None)
+        self.type = kwargs.get('type', None)
 
 
 class CheckNameAvailabilityResult(msrest.serialization.Model):
diff --git a/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/models/_models_py3.py b/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/models/_models_py3.py
index d516780d606c..974dfe1361c6 100644
--- a/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/models/_models_py3.py
+++ b/sdk/managementgroups/azure-mgmt-managementgroups/azure/mgmt/managementgroups/models/_models_py3.py
@@ -73,34 +73,29 @@ def __init__(
 class CheckNameAvailabilityRequest(msrest.serialization.Model):
     """Management group name availability check parameters.
 
-    Variables are only populated by the server, and will be ignored when sending a request.
-
     :param name: the name to check for availability.
     :type name: str
-    :ivar type: fully qualified resource type which includes provider namespace. Default value:
-     "Microsoft.Management/managementGroups".
-    :vartype type: str
+    :param type: fully qualified resource type which includes provider namespace. The only
+     acceptable values to pass in are None and "Microsoft.Management/managementGroups". The default
+     value is None.
+    :type type: str
     """
 
-    _validation = {
-        'type': {'constant': True},
-    }
-
     _attribute_map = {
         'name': {'key': 'name', 'type': 'str'},
         'type': {'key': 'type', 'type': 'str'},
     }
 
-    type = "Microsoft.Management/managementGroups"
-
     def __init__(
         self,
         *,
         name: Optional[str] = None,
+        type: Optional[str] = None,
         **kwargs
     ):
         super(CheckNameAvailabilityRequest, self).__init__(**kwargs)
         self.name = name
+        self.type = type
 
 
 class CheckNameAvailabilityResult(msrest.serialization.Model):