diff --git a/openbis_ng_ui/src/js/components/types/objectType/ObjectTypeParametersProperty.jsx b/openbis_ng_ui/src/js/components/types/objectType/ObjectTypeParametersProperty.jsx
index 0f02c04e0b7d6f0b70a8c7c8681c2a2c11cff606..7aae1e80048180ab35343f8db9a04cce27ea635c 100644
--- a/openbis_ng_ui/src/js/components/types/objectType/ObjectTypeParametersProperty.jsx
+++ b/openbis_ng_ui/src/js/components/types/objectType/ObjectTypeParametersProperty.jsx
@@ -235,7 +235,7 @@ class ObjectTypeParametersProperty extends React.PureComponent {
           name='code'
           mandatory={true}
           error={property.errors.code}
-          disabled={property.usages > 0}
+          disabled={!!property.original}
           value={property.code}
           onChange={this.handleChange}
           onFocus={this.handleFocus}
diff --git a/openbis_ng_ui/src/js/components/types/objectType/ObjectTypeParametersType.jsx b/openbis_ng_ui/src/js/components/types/objectType/ObjectTypeParametersType.jsx
index 86abb48bee26548d9d7621a4c22c4ed586cc7452..0a5b20a4b5c07d476ee30b14e4b9e71e1032d55b 100644
--- a/openbis_ng_ui/src/js/components/types/objectType/ObjectTypeParametersType.jsx
+++ b/openbis_ng_ui/src/js/components/types/objectType/ObjectTypeParametersType.jsx
@@ -162,7 +162,7 @@ class ObjectTypeParametersType extends React.PureComponent {
           name='code'
           mandatory={true}
           error={type.errors.code}
-          disabled={type.usages > 0}
+          disabled={!!type.original}
           value={type.code}
           onChange={this.handleChange}
           onFocus={this.handleFocus}