Neto maintains a 'Cost Price (Excl Tax)' field for each product including kits/bundles. This value is what Neto uses to calculate Margin when creating a quote. This has always been a static figure, so if the cost of kit components changed you would need to recalculate the new kit cost and change the figure. With advanced inventory turned on it is no longer possible update this field, even manually. Therefor the Margin calculations is likely to be incorrect. I would like to see this field updated dynamically or frequently to reflect the cost of the components that make it up.