Unable to create multiple leaves of a leaf-list when it is Augmenting a list.

[BanuPrakashReddy]

I know that augmenting a leaf-list to a list is pretty normal and it should work. But, when I am augmenting a leaf-list to a list in ietf-system.yang file. I am facing the problem as mentioned below:

Even after configuring multiple leaves(one by one) of an augmented leaf-list, only the last leaf exist in the configuration.

Below is the yang file , which I used :

_**module abc-system-authentication {

namespace "http://www.abc.com/ns/yang/" +
"abc-system-authentication";
prefix a-sys-auth;

import ietf-system {
prefix sys;
}

contact
"http://www.abc.com/";

description
"This module contains a collection of YANG definitions to
support extension of authentication functionality on the device.";

revision 2016-11-22 {
description
"Initial revision.";
reference
"None.";
}

augment "/sys:system/sys:authentication/sys:user" {
description
"Augment the local user with an optional user group
assignment.";

    leaf-list system-defined-group {
      type string;
      description
        "The name of the system defined group(s) to which the user
         is assigned. A system defined group is one that exists
         on the system but is not explicity created.";
    }

}

}**_

Below it the configuration I pushed first :

<sys:system xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns:sys="urn:ietf:params:xml:ns:yang:ietf-system">
sys:authentication
<sys:user nc:operation="merge">
sys:nametest</sys:name>
<a-sys-auth:system-defined-group xmlns:a-sys-auth="http://www.abc.com/ns/yang/abc-system-authentication">xyz</a-sys-auth:system-defined-group>
</sys:user>
</sys:authentication>
</sys:system>

Then pushed the below configuration :

<sys:system xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns:sys="urn:ietf:params:xml:ns:yang:ietf-system">
sys:authentication
<sys:user nc:operation="merge">
sys:nametest</sys:name>
<a-sys-auth:system-defined-group xmlns:a-sys-auth="http://www.abc.com/ns/yang/abc-system-authentication">xyz2</a-sys-auth:system-defined-group>
</sys:user>
</sys:authentication>
</sys:system>

When I do get-configuration, I always see output as :

<sys:system xmlns:sys="urn:ietf:params:xml:ns:yang:ietf-system">
sys:authentication
sys:user
sys:nametest</sys:name>
<a-sys-auth:system-defined-group xmlns:a-sys-auth="http://www.abc.com/ns/yang/abc-system-authentication">xyz2</a-sys-auth:system-defined-group>
</sys:user>
</sys:authentication>
</sys:system>