Manual Revaluation and the Asset Revaluation (Inflation) Program 
Use
Normally, the Asset Revaluation (Inflation) program does not revaluate again assets that you have manually revaluated for a given interval. You can, however, override this function if you wish.
Features
Nonrevaluation of Manually Revaluated Assets
Normally, the Asset Revaluation (Inflation) program does not revaluate again assets that you have manually revaluated for a given interval.

Assume that in June you manually revaluate an asset worth UNI 25,000 by UNI 1,000. When at the end of the interval (that is, on 30 June) you come to run the Asset Revaluation (Inflation) program, it recognizes that you have already revaluated the asset and does not attempt to revaluate it again.
Revaluation of Manually Revaluated Assets
However, you can also customize the system so that the program does revaluate the asset. In that case, the program:
Activities
To activate the revaluation of manually revaluated assets, you must assign the revaluation area a revaluation difference area, which you can do in Customizing for Financial Accounting (FI), by choosing Asset Accounting ® Special Valuation ® Revaluation of Fixed Assets ® Revaluation for the Balance Sheet ® Inflation Accounting ® Revaluation Areas ® Define Base Depreciation Areas.