错误消息：Transaction in area 20 contradicts the net book value rule
Message no. AA660

解决方法：

1. Need to do configuration change for depreciation area 01 - "Define depreciation area details:"

Path: SPRO --> Fin.acctg --> Asset accounting --> Valuation --> depreciation areas --> @Define depreciation areas

2. select the area - first with "01"

3. In the tab "Value Maintenance" , against the "Net book value", select "All values Allowed"

SAVE..