REVIEW / RE-NEGOTIATION OF CONTRACT AND FISCAL TERMS. 27.1 The Parties agree that the commercial terms and conditions of this Contract have been negotiated and agreed having due regard to the existing fiscal terms in accordance with the provisions of the Petroleum Law and the Petroleum Taxation Law in force at the time of the Effective Date. If such fiscal terms are materially changed to the detriment of the Contractor, the Parties agree, subject to Clause 27.2, to review the terms and conditions of this Contract affected by such changes and to align such terms and conditions with the fiscal terms as at the Effective Date.