What causes this issue?

The ordinary depreciation start date &V1& has been changed. 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 depreciation start date is decisive
for determining depreciation. This will be altered by the change, but
only in the fiscal years which are still open, in other words from
&V2&.

How to fix this error?

A. Confirm that you want to change the ordinary 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.