It is very cumbersome to have 1 billing service type for everyone in group. Different clients are billed differently. EG- std pmt is $40, some should be billed $0,some reduced @$20,etc.
When invoices are auto generated then we must delete all those that have incorrect billing amt and manually generate invoice for correct service pmt type.
This is very common problem anytime the group has members sponsored by differnt entities besides themself.