The company’s contribution may not replace any of the remuneration elements, such as those taken into account to determine the basis of contributions defined inarticle L. 242-1 of the Social Security Code, in force in the company at the time of setting up a plan mentioned in this article or which become compulsory by virtue of legal or contractual rules. However, this rule may not have the effect of calling into question the tax and social security exemptions provided for in article L. 3332-27, provided that a period of twelve months has elapsed between the last payment of all or part of the suppressed remuneration and the date of implementation of the plan.