You might have read about that Syncee automatically converts your supplier's currency to Shopify's currency (read more about it here). If you do not want to rely on the fluctuating currency prices, you can enter a simple operation to the "Operations" field, like "*310" or "/100", so that you will be able to convert your supplier prices using a fixed conversion rate.
Please keep in mind that you shouldn't use a comma to separate decimal values. Use the US standard, decimal point. For instance, instead of +4,5 you need to enter +4.5
If you have any questions about pricing or anything else, get in touch with our support staff.