How to open Periods in Oracle Apps

To Create  sales order,  for a given month(period), that  month  should be opened in  five Modules.

·         GL-> Setup-> Open /Close.

·         AP-> Accounting ->Control Payable Periods.

·         PO->Setup->Financials-> Accounting->Open/Close Periods.

·         INV->Accounting Close Cycle ->Inventory Accounting Period->(Selct Org )

·         AR->Control ->Accounting ->Open/Close  Periods.