SAP Message AC676 - No longer possible to change 'depreciation to the day' indicator

Diagnosis
You want to change the 'depreciation to the day' indicator for thecurrent calculation key.
This is no longer possible, since this calculation key is used indepreciation key &v2&, and assets were already posted that usedepreciation key &v2&. This applies, at the mimimum, to asset &v3&-&v4&in company code &v1&.

System Response
You cannot change the setting the of the 'depreciation to the day'indicator.