private void AddChildData(Observation parent, ObservationCost child)
        {
            if (child.PaidCopay == 0 && child.PaidCoinsurance == 0 && child.PaidTowardDeductible == 0 &&
                child.PaidByPayer == 0 && child.TotalPaid == 0)
            {
                return;
            }

            _personBuilders[parent.PersonId].Value.AddChildData(parent, child);
        }
 public void AddChildData(Observation parent, ObservationCost child)
 {
     parent.ObservationCost = new List <ObservationCost> {
         child
     };
 }