Mediated settlement agreements may be challenged only for fraud, corruption, impersonation, or being unfit for mediation within strict time limits. A mediated settlement agreement may be challenged in a competent court or tribunal only on the grounds of fraud, corruption, impersonation, or where the dispute was not fit for mediation; the challenge must be made within ninety days of receipt of the agreement, with a possible single discretionary extension of a further ninety days for sufficient cause.