On 15.02.2020, our professional development trainings were held in our Headquarters MHU Conference Hall between 09:00 - 16:00. Within the scope of the training, Generalized Preferences System (GTS) and Registered Exporter System REX Application / Statement Codes in the Declaration Filling Instructions, Requirements to be Observed According to the Sectors in the Determination of the Customs Tariff Statistical Position, Approved Person Status Certificate - Authorized Employer Status, Simplified Applications, Incoterms 2020, Topics of Single Window Portal System, Inward Processing Permit Regime, Inward Processing Regime Automation System, Inward Processing Permission Use Export Error Analysis were discussed.