100As regards the nature of the error, the Court pointed out in the above cases that it is necessary to consider in each case whether the rules concerned are complex or simple enough for an examination of the facts to make an error easily detectable. As regards the degree of care shown, if the traders concerned have doubts as to the definition of the origin of the goods, they must make inquiries and seek the greatest clarification possible in order to ascertain whether those doubts are well founded.
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