private void Fixupv_Vehicle_Model(v_Vehicle_Model previousValue)
        {
            if (previousValue != null && previousValue.v_Customer_Vehicle.Contains(this))
            {
                previousValue.v_Customer_Vehicle.Remove(this);
            }

            if (v_Vehicle_Model != null)
            {
                if (!v_Vehicle_Model.v_Customer_Vehicle.Contains(this))
                {
                    v_Vehicle_Model.v_Customer_Vehicle.Add(this);
                }
                if (model_id != v_Vehicle_Model.model_id)
                {
                    model_id = v_Vehicle_Model.model_id;
                }
            }
        }
        private void Fixupv_Vehicle_Model(v_Vehicle_Model previousValue)
        {
            if (previousValue != null && previousValue.v_Customer_Vehicle.Contains(this))
            {
                previousValue.v_Customer_Vehicle.Remove(this);
            }

            if (v_Vehicle_Model != null)
            {
                if (!v_Vehicle_Model.v_Customer_Vehicle.Contains(this))
                {
                    v_Vehicle_Model.v_Customer_Vehicle.Add(this);
                }
                if (model_id != v_Vehicle_Model.model_id)
                {
                    model_id = v_Vehicle_Model.model_id;
                }
            }
        }