Vertex - Cancel invoice

Hello experts,

Here is the scenario. An invoice document is created with tax value $100 (say 10%). Assume that it was incorrect. Before this invoice could be cancelled, vertex is updated with the latest info (correct %). Now, if the invoice document is to be reversed/cancelled, what would be the tax amount in the cancelled doc? New tax value or the original tax value?

If it is new tax value, is there a way to stop it? Any input would be rewarded with points.