This was being done with a view to restore economic benefits as mentioned in the signed contracts under which it operates, the correspondence, reviewed by PTI, showed. It argued that the contracts, called production sharing contract or PSC, provides for fiscal stability for the contracting parties. The PSC states that in the event of change of law or rule or regulation that results in adverse change to the expected economic benefits to any of the parties, the parties shall consult promptly and make necessary revisions and adjustments to the contract in order to maintain such expected economic benefits to each of them.