Ikhowudi yamazwe ngamazwe ye-Harmonized System esetyenziselwa ukuhlela iimveliso ngeenjongo zerhafu yempahla.
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Ikhowudi ye-HS (Harmonized System) yinkqubo yamazwe ngamazwe yokuhlela iimveliso eyaphuhliswa yiWorld Customs Organization (WCO). Amanani amathandathu okuqala ayafana kumazwe ngamazwe; amazwe ongeza amanani awo esizwe ngaphezulu. ETurkey, le khowudi yaziwa ngokuba yi-GTİP.
Ikhowudi echanekileyo imisela iirhafu zempahla ezisebenzayo, izithintelo zokungenisa namaxwebhu afunekayo, ngoko kucetyiswa ukuba uqinisekise ukuhlelwa kwemveliso nearhente yerhafu yempahla.