A visa does not give the holder an absolute right to entry the Schengen territory, but is only one of the conditions that must be fulfilled for entry. The applicant must for every entry be able to prove that he / she fulfills the conditions according to the Schengen agreement art 5.1
For visits not exceeding three months entry into the territories of the Contracting Parties may be granted to an alien who fulfills the following conditions:
(a) in possession of a valid document or documents permitting them to cross the border, as determined by the Executive Committee;
(b) in possession of a valid visa if required;
(c) if applicable, submits documents substantiating the purpose and the conditions of the planned visit and has sufficient means of support, both for the period of the planned visit and to return to their country of origin or to travel in transit in a Third State, into which their admission is guaranteed, or is in a position to acquire such means legally;
(d) has not been reported as a person not to be permitted entry;
(e) is not considered to be a threat to public policy, national security or The international relations of any of the Contracting Parties.