P.R. Laws tit. 31, § 3284
2019-02-20 00:00:00+00
A note written or signed by a creditor at the end, in the margin, or on the back of an instrument held by him constitutes evidence in all that may be favorable to the debtor.
The same shall be understood of a note written or signed by the creditor, on the back, in the margin, or at the foot of the duplicate of an instrument or receipt which the debtor may hold.
In either case the debtor who wishes to avail himself of what may be favorable to him shall have to abide by what is prejudicial.
History —Civil Code, 1930, § 1183.