Exact Fees of Each Order via API
Sellics receives the exact fees for each individual order via Amazon's MWS API.
"Optimistic" Fees Preview in Seller Central
The fees shown in Seller Central's Inventory Overview is just a vague preview which assumes that the goods are stored in and transported within the same country.
This is only the case for local fulfillment, or when being part of the Pan-European program.
Correct Fees shown in Seller Central Transaction Report
The actually billed fees can be found within the transaction report (Seller Central > Reports > Payments > Transactions).