Hi Veselina, SK,
Control Code is std field in Foreign Trade / Export View of the material master. This field represents a commodity code or a tariff number for material that is used in Foreign Trade. For India localisation, it is known as Chapter ID.
Refer Tables-Field
MARC-STAWN (Plant Data for Material - Comm./imp. code) - Here commodity code/tariff number is maintained in material master
T604-STAWN (Foreign Trade: Commodity Code / Import Code Number - Comm./imp. code) - Here you maintain allowed commodity code/tariff number against the country.
Thanks, JP