Posting period 001 2013 is not open

Dear All,

I have recently setup a new SAP Application Server. Since I am not a BASIS consultant, so I dont know all the configurations settings need to be done.

Now I am creating Data in the New SAP Server. I have already created PO, Vendor and done basic settings for it.

However I am facing some issues while Postings.

1. While doing MIGO Posting, I am getting Error

      Posting period 001 2013 is not open

I have changed the year settings in OB52. and called Transaction MMPV also. I also executed T-Code OBH2 but no output from OBH2.

Can someone suggest me what needs to be done??