Open back periods for in MM

Hi,

My problem is that to I need to post the invoices in the 02/2007 period in MM but the system is not allowed to do.I had also tried through T code MMRV but it is only for one back peirod i.e in this case previous period 04/2007.But how can I reach 02/2007 to post the invoices.Also tell me the T code and steps to reach this.