SAP Message AC091 - Manual entries are not possible (area defined to adopt identical values)

Diagnosis
You specified a depreciation area in which the acquisition value is tobe reduced by investment support.
This depreciation area &V1& is defined so that it automatically adoptsvalues from area &V2&. You cannot, therefore, enter values manually inthis area.

System Response
The system deletes your entry.

Procedure
If you enter area &V2&, the system automatically reduces theacquisition values in this area and in area &V1&.