What causes this issue?

You have changed the special depreciation start date &V1&. The
depreciation start date is in a closed fiscal year. You cannot change
depreciation in closed fiscal years.

System Response

The System allows this change. The special depreciation start date is
decisive in determining depreciation. This will be altered by the
change but only in fiscal years which are still open, in other words
from &V2&.

How to fix this error?

A. Confirm your change to the special depreciation start date.
B. Check the expired useful life and correct this if necessary, because
this also influences depreciation.

Error message extract from SAP system. Copyright SAP SE.