I have installed Virtuemart and I have a CVSI template to import two fields: Product SKU and Product Price
I run the template and the price is imported fine. But the tax and discount are erased after the import.
Thank you for posting the debug log. In your import template on Options tab you have set Delete existing prices field to Yes. This setting will delete existing prices and insert new price from import file. That is the reason tax and discounts are deleted. You need to set this option to No and run the import.