Hi,
There are two options:
Option 1 - As mentioned by Bernhard above, you need the company code to use half periods, then it would use your configuration.
Option 2 - Use an Alternative Fiscal Year Variant for tax areas with 24 periods if you...
If you are on ERP 6.0 EhP 5 or above, you can turn on the business function New General Ledger Accounting 3, and use the mass processing for impairment.
You could use it for actual data too. Example - You could calculate % bonus or commission directly in COPA using a new value field based upon actual sales coming in from other modules.- Jayesh