HI Steve,

Sorry for the delay in responding.

For Sundry Items, the unit cost will always be 2 decimals. There is a wishlist item to change this on a future release.

For Inventory items, you can enable the Profile option: Use IC alternative price list. In IC, you can import alternate item with 4 decimals for Markup cost.

PurchaseOrders also has an option for Update price list cost amount. If you use this option, the Markup cost on the alternate price list item will be updated. However, it is calculated from the extended cost for the item and that may not be to 4 decimals.