§1. If in the text of the sentence an error in calculations turns up, a material error occurs in transcribing the dispositive section or in relating the facts or the petitions of the parties, or the requirements of can. 1612, §4 are omitted, the tribunal which rendered the sentence must correct or complete it either at the request of a party or ex officio, but always after the parties have been heard and a decree appended to the bottom of the sentence.
§2. If any party objects, the incidental question is to be decided by a decree.
Source: Code of Canon Law (Vatican.va)