RestAPI Attributes on api2.xml not visible on Admin Rest-Attributes

[anusha_das]

My api2.xml -

<ext278 translate="title" module="Rs_Ext">
                <group>ext</group>
                <model>ext/api2_admindeliverytask</model>
                <title>Delivery Task</title>
                <sort_order>278</sort_order>
                <privileges>
                    <admin>
                        <create>1</create>
                    </admin>
                </privileges>
                <attributes>
                    <data>data</data>
                </attributes>
                <routes>
                    <route>
                        <route>/adm/v7/admindeliverytask</route>
                        <action_type>collection</action_type>
                    </route>
                </routes>
                <versions>1</versions>
            </ext278>

The API shows up under Rest-Roles>Admin>Resources but not under Rest-Attributes>Admin