This object specifies whether the target service specifies a
network-forwarding policy:
'primary'
The target service specifies a network-forwarding
policy. Primary services are mutually exclusive; that
is, only one primary service can be activated for any
given subscriber session.
'secondary'
The target service has a dependence on the primary
service in the group specified by the corresponding
instance of cdtSuBSrvSgSrvGroup. After the system
activates the primary service, it activates secondary
services. When the system deactivates the primary
service, then it deactivates all the secondary services
in the service group.
This column is valid only if the 'sgSrvType' bit of the
corresponding instance of cdtSrvValid is '1'.