Jeopardizing your success with a poor customs performance record
Prepare your customs issues properly for each details of the chain . Have your records audited by external experts and make sure your valuation and tariff codes are in good chape and meet the requirements of the EU-legislation.
Awareness of the actual restrictions in trading with certain areas in the world. Dual use products need export permissions.
If you run your own DC consider application of the A.E.O. license (Authorized Economic Operator) this will give you more advantages dealing with customs and regulations.