<prompt> Translate the following text to EnglishSheria ya Forodha na Biashara ya 1990 ilibadilisha ushuru huo ili ufanane na majukumu ya Marekani chini ya GATT Mkataba Mkuu wa Tarifu na Biashara baada ya jopo la GATT kuamua kwamba ushuru wa awali mshahara wa moja kwa moja wa thamani ulizidi gharama ya huduma zilizotolewa na ilikuwa ushuru juu ya uagizaji ambao uligundua ubaguzi dhidi ya uagizaji kwa manufaa ya ndani.  <response>: The fee as originally enacted was modified by the Customs and Trade Act of 1990 to make it consistent with U.S. obligations under GATT the General Agreement on Tariffs and Trade after a GATT panel had ruled that the original fee a straight ad valorem fee exceeded the cost of services rendered and was a tax on imports that discriminated against imports in favor of domestic production. 