Accounting Period not open
I am tryng to perform GR with a PO, system says document is OK but accounting period 012 2007 is not open. Then i use MMPV and check n close for 12 2007. Now when I see the MMRV, current period is 001 2008 and previous is 12 2007 as I have closed 012 2007. But when i try and Post GR in 001 2008 system displays error posting only possible in the periods 12 2007 abd 001 2008 . Please tell me how to solve this problem.
Points will be awarded definitely for the right answer.