Lawyers better dot their i’s and cross their t’s before making settlement offers they can’t take back, according to a recent Pennsylvania Superior Court decision. Not only will the court enforce the settlement, it may also order sanctions against the party that refused to pay it right away.

“If a mistake is not mutual, but unilateral, and is not due to the fault of the party not mistaken, but to the negligence of the one who acted under the mistake, it affords no basis for relief,” Judge Vincent A. Cirillo wrote.