Unit cost price decimal

Hi, I cannot amend the unit price of the item on a sales invoice, to 4 digit decimal. The price of the item I am selling is GBP0.0188 per unit, but it appears as 0.02 on the invoice when I type it. I will need the decimals to be 4?

A post was merged into an existing topic: Purchase Order/Inventory - Unit Amount to 4 Decimal Places