Add first depreciation area

Hi,

The asset class was set with no active depreciation area. The assets were created within this asset class. (For some reasons it was ok- only master data without values.)

Now the asset class was changed and deprecation area 01 is active. The new assets are created with depreciation area.

How can I add depreciation area to old assets? TC AFBN need the reference depreciation area but there is no one.

thanks

Ryszard