Public MustOverride Sub chargeVolumeReservation ( _
	charging As Charging, _
	volume As Long, _
	billingText As String, _
	referenceCode As String _
)

public abstract void chargeVolumeReservation (
	Charging charging,
	long volume,
	string billingText,
	string referenceCode
)

public:
virtual void chargeVolumeReservation (
	Charging^ charging, 
	long long volume, 
	String^ billingText, 
	String^ referenceCode
) abstract