Question: the error flag below, when inputting a new asset purchase did not seem correct; I understand that a MV write off may be allowed with exception of any part of the purchase price over the luxury car limit, and always subject to the prevailing instant asset write off threshold.

Answer: Instead of using "General Pool" you need to use Immediate write off  (if you are using Simplified Depreciation Rules) You should create a new asset group as on the screenshot below and add all immediate write-off assets there.

Depreciation rule for $5000 immediate write off for cars cannot be applied for cars bought after 31 December 2013. Click here to know more about