‘For stays not exceeding three months, aliens fulfilling the following conditions may be granted entry into the territories of the Contracting Parties:
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that the aliens possess a valid document or documents, as defined by the Executive Committee, authorising them to cross the border;
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that the aliens produce, if necessary, documents justifying the purpose and conditions of the intended stay and that they have sufficient means of subsistence … or are in a position to acquire such means lawfully;
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that the aliens shall not be persons for whom an alert has been issued for the purposes of refusing entry;
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that the aliens shall not be considered to be a threat to public policy, national security or the international relations of any of the Contracting Parties.’