SAP Message AC391 - There is an error in the specifications for area &1 in co. code &2

Diagnosis
You specified for depreciation area &V1& that asset values are to beautomatically posted online, and that this area is to take over bookvalues from another area. This specification is not correct. An areathat allows for online automatic posting cannot take over values fromanother area.

Procedure
Correct the specifications for area &V1&.