Catechism of the Catholic Church §2537 — excerpt
It is not a violation of this commandment to desire to obtain things that belong to one's neighbor, provided this is done by just means.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: Roman Catechism, III, 37