Parent-child SAGs

I am attempting to configure a SAG with other, valid, configured SAGs as destinations:

 

session-group
        group-name                     ATT-parent-SAG
        description                   
        state                          enabled
        app-protocol                   SIP
        strategy                       Hunt
        dest                          
                                       sag:ATT-Group1
                                       sag:ATT-Group2
        trunk-group                   
        sag-recursion                  disabled
        stop-sag-recurse               401,407

 

When I perform a verify-config, I get this:

 

sbc1# verify-config
--------------------------------------------------------------------------------
ERROR: session-group [ATT-parent-SAG] has reference to session-agent [sag:ATT-Group1] which does not exist
ERROR: session-group [ATT-parent-SAG] has reference to session-agent [sag:ATT-Group2] which does not exist

 

I read another post that suggested this feature may not be supported. Is this capability supported? According to the 6.3.0 ACLI documentation, it is supported:

 

"destination

—Identify the destinations (session agents) available for use by this session agent group. A value you enter here must correspond to a valid group name for a configured