SAP Message AA973 - Depreciated number of units & determined by System (please check)

Diagnosis
For unit-of-production depreciation, the system determined the numberof units based on the previously used number &V1&. The &V2& unitsthat you entered for depreciation key &V3& differs from this number.

Procedure
Check if this variance is allowed. It could be the result ofmultiple-shift use or shutdown.
If necessary, correct the defined number of units for theunit-of-production depreciation key &V3&.