What the poster actually wants to know is whether deferment of wage revision is possible on a/c of losses incurred by the employer for the last consecutive three years.
Though it may be a valid reason based on adequate evidence, it is left to the discretion of the employees to accept or reject it forthwith particularly when there is no provision for V.D.A linked to any cost of living index. The employees can advance a counter argument that they are in no way responsible for business losses since effective management is the responsibility of the employer.
In such a precarious situation, in stead of outright deferment, the employer should come forward with some acceptable alternatives like grant of interim relief etc.