I really don't think any kind of canon law was broken but rather the Bishop's ego was violated and a crackdown was in order.
Depending on circuмstances, this one could be relevant:
Can. 390 A diocesan bishop can perform pontifical functions in his entire diocese but not outside his own diocese without the express, or at least reasonably presumed, consent of the local ordinary.These canons would also seemingly be violated:Can. 1015 §1. Each person is to be ordained to the presbyterate or the diaconate by his proper bishop or with legitimate dimissorial letters from him.
§2. If not impeded by a just cause, the proper bishop is to ordain his own subjects personally; without an apostolic indult, however, he cannot ordain licitly a subject of an Eastern rite.
Can. 1016 As regards the diaconal ordination of those who intend to be enrolled in the secular clergy, the proper bishop is the bishop of the diocese in which the candidate has a domicile or the bishop of the diocese to which the candidate is determined to devote himself. As regards the presbyteral ordination of secular clerics, it is the bishop of the diocese in which the candidate was incardinated through the diaconate.
Can. 1017 A bishop cannot confer orders outside his own jurisdiction without the permission of the diocesan bishop.
There are probably others.