Inventory Adjustment to zero amount

Hi, I'm trying to adjust my inventory to leave none in stock. The problem I'm having is that I am given an error message that the inventory value must be $0. My unit cost is 6 decimal places (not sure why) but I can only enter 2 decimal places in the amount column. When I try to add the extra decimal places, it shows me the number and then rounds it when I try to save.

Does someone have a solution to make the amount $0?

Thanks in advance.