Define Plan Periods
In this activity you can determine the posting periods allowed for entering planning data. You can create permitted posting periods in the form of variants, which can then be assigned to company codes.
Note
You assign variants to company codes in the the
activity 
Enter Global Parameters in the IMG for "Financial Accounting
Global Settings" in the field "Pstng period variant".
Activities
1. Define the
permitted posting periods (the first and last valid periods and the first and
last valid years) in the form of variants.
2. Specify
whether authorization will be necessary to use the permitted posting
periods.