Additional Accounts in Asset Accounting 
You can use additional accounts to handle parallel accounting .
In this scenario you post to the General Ledger Accounting (FI-GL) and Asset Accounting (FI-AA) components.
For each depreciation area that posts values for a parallel accounting principle, you enter its own separate account set for APC and depreciation.
Recommendation
In certain instances you have to add new accounts to the chart of accounts. You have to create these additional accounts in the company code, so that the accounts can be assigned to the depreciation areas. It follows that each additional accounting principle, for which you want to post in General Ledger Accounting, increases the number of accounts needed in Asset Accounting.
If you manage parallel currencies in the company code, you have the following options:
Historical management of values:
You set up an additional parallel currency depreciation area for the posting depreciation area. In Customizing for Financial Accounting (New) , choose
Valuation in the parallel currency is entered on the assigned G/L accounts and in Asset Accounting, using the historical currency exchange rates of the original posting (for example, the invoice receipt).
Management of values related to a key date:
The values of the posting depreciation area are translated into the parallel currency for this area on the key date of the direct or periodic document creation.
You enter the necessary additional accounts in Customizing for
For each accounting principle, you have to create a new financial statement version based on the additional accounts.