P.R. Laws tit. 31, § 3161 : ONE Civil Code —Subtitle 4 Obligations and Contracts —PART I. Obligations —Chapter 247. Extinction of Obligations —Subchapter I. Payment —§ 3161. When debt is considered paid
A debt shall not be considered as paid until the full amount of the thing has been delivered, or the prestation of which the obligation consisted has been made.