diff --git a/fim/__init__.py b/fim/__init__.py
index 0084f68..7e5f261 100644
--- a/fim/__init__.py
+++ b/fim/__init__.py
@@ -1,5 +1,5 @@
 """
 FABRIC Information Model library and utilities
 """
-__VERSION__ = "1.7.0b3"
+__VERSION__ = "1.7.0b4"
 __version__ = __VERSION__
diff --git a/fim/slivers/network_service.py b/fim/slivers/network_service.py
index 77bba5e..1306978 100644
--- a/fim/slivers/network_service.py
+++ b/fim/slivers/network_service.py
@@ -172,8 +172,7 @@ class NetworkServiceSliver(BaseSliver):
                                                    num_instances=NO_LIMIT,
                                                    desc='A Site-to-Site service in FABRIC.',
                                                    required_properties=[],
-                                                   forbidden_properties=['ero',
-                                                                         'mirror_port',
+                                                   forbidden_properties=['mirror_port',
                                                                          'mirror_direction',
                                                                          'controller_url'],
                                                    required_interface_types=[]),