"Other attributes" field in vCloud entity

Hello,

   Suppose I execute the following piece of code :

     com.vmware.vcloud.sdk.admin.ExternalNetwork vcloudExternalNetwork =
                    com.vmware.vcloud.sdk.admin.ExternalNetwork.getExternalNetworkById(vCloudClient, "urn:vcloud:network:6b969221-9aa2-4a09-b55c-2576e97b7b1a");

My question is :

Why vcloudExternalNetwork.getResource().getOtherAttributes(); returns always an empty map ?

REMARK : When I execute a query through vCloud query service the ".getOtherAttributes()" is full of data

REMAKR : This is not related only to vCloud external network entity, but for other vCloud entities as well

Thank you