A fixed contract set for 4 years,starting in March 2000 and expires at the end
of Febr. 2004 by US-law. Is that contract open for termination before the
expiring date by the opposition-party,because of a clause which has been issiued
in the maincontract 1994.Does a fixed contract issiued recently abolish this
clause?

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Clarification of Question by manne-ga on 11 Sep 2002 23:46 PDT

The "fixed contract" for a four year periode was issued because the 
concessionaire reduced his requested fee by 19%. A normal contract only
runs 2 years with a higher fee request. This fixed contract was offert
by the opposition party. Reason for termination: For convenience.

It depends on what situatiation you are in. Most of the time, it'll favor your side.