Can SAGs be placed inside a session-group?

Hi,

ACLI reference manual states:

"The session-agent-group element creates a group of Session Agents and/or groups of other SAGs."

Whilst trying to do this i get the following verification errors having tried different inputs:

"ERROR: session-group [bobtest] has reference to session-agent [SAG:sagtest.example.com] which does not exist"

ERROR: session-group [bobtest] has reference to session-agent [sagtest.example.com] which does not exist

Is it possible to place a SAG within a session-group, if so how?

Thanks

Bob