If an employee did not provide information about relevant professional experience at the time of hiring but later submits such information—and refuses to sign an agreement for a lower base salary (so that the base plus the length-of-service increment equals the previously agreed gross amount)—is it legally acceptable, based on a signed declaration that no employment book was submitted upon hiring, to disregard the newly provided professional experience and retain the base salary as originally agreed?

If an employee did not provide information about relevant professional experience at the time of hiring but later submits such information—and refuses to sign an agreement for a lower base salary (so that the base plus the length-of-service increment equals the previously agreed gross amount)—is it legally acceptable, based on a signed declaration that no employment book was submitted upon hiring, to disregard the newly provided professional experience and retain the base salary as originally agreed?