Canon 112. §1 After the reception of baptism, the following are enrolled in another Church sui iuris:

1° one who has obtained permission from the Apostolic See;

2° a spouse who, on entering marriage or during its course, has declared that he or she is transferring to the Church ‘sui iuris’ of the other spouse; on the dissolution of the marriage, however, that person may freely return to the Latin Church;

3° the children of those mentioned in nn. 1 and 2 who have not completed their fourteenth year, and likewise in a mixed marriage the children of a Catholic party who has lawfully transferred to another Church ‘sui iuris’; on completion of their fourteenth year, however, they may return to the Latin Church.

§2. The practice, however long standing, of receiving the sacraments according to the rite of another Church ‘sui iuris’, does not bring with it membership of that Church.

§3. Each transfer to another Church ‘sui iuris’ is valid from the moment of the declaration made in the presence of the local ordinary of the said Church or of its
pastor or of the priest delegated by one of them and of two witnesses, unless a rescript of the Apostolic See disposes otherwise; and is noted in the baptismal register.
[revised wording according to m.p. De concordia inter Codices, 31.V.2016]

§1. Post receptum baptismum, alii Ecclesiae sui iuris ascribuntur:

1° qui licentiam ab Apostolica Sede obtinuerit;

2° coniux qui, in matrimonio ineundo vel eo durante, ad Ecclesiam sui iuris alterius coniugis se transire declaraverit; matrimonio autem soluto, libere potest ad latinam Ecclesiam redire;

3° filii eorum, de quibus in nn. 1 et 2, ante decimum quartum aetatis annum completum itemque, in matrimonio mixto, filii partis catholicae quae ad aliam Ecclesiam sui iuris legitime transierit; adepta vero hac aetate, iidem possunt ad latinam Ecclesiam redire.

§2. Mos, quamvis diuturnus, sacramenta secundum ritum alius Ecclesiae sui iuris recipiendi, non secumfert adscriptionem eidem Ecclesiae.

§3. Omnis transitus ad aliam Ecclesiam sui iuris vim habet a momento declarationis factae coram eiusdem Ecclesiae Ordinario loci vel parocho proprio aut sacerdote ab alterutro delegato et duobus testibus, nisi rescriptum Sedis Apostolicae aliud ferat; et in libro baptizatorum adnotetur.