Taxes not applied because of maximum net price

Hey, I am really new to erpnext. I love the software so far but I am running into a problem where I create an item and add an tax template. There is this field called max net price and by default it is set to 0,00. So when I try to add it to an invoice erpnext is not calculating the taxes. I tested a bit and the reason why it is not calculating the taxes seems to be this field. How can I make it that erpnext will always calcultate the taxes and not having to input like a maximum number that theoretically could be exceeded. I would really love to know how you made your setup and what the right way to configure this would be
Cheers✌🏻