You will require this approval if you intend to undertake any type of activity that may significantly impact on an Australian government Heritage place that is located overseas.
An action has, will have, or is likely to have a significant impact on the heritage values of a declared place if it does, will, or is likely to result in one or more of the heritage values being lost, damaged or degraded.
If the activity involves several stages then you may need to gain approval for each stage.