Article 1233

A debt shall not be understood to have been paid unless the thing or service, in which the obligation consists has been completely delivered or rendered as the case may be.

Ang isang utang ay hindi uunawain na bayad maliban kung ang bagay o serbisyo kung saan ang obligasyon ay ganap ng naihatid o naisagawa sa kung alinman.

A debt may refer to an obligation to deliver money, to deliver a thing (other than money), to do an act or not to do an act.

It must be on the currency agreed on, and in the time and place stipulated. The thing delivered or service rendered must be exactly that which was the object of negotiation.

Example:  Sioti promised to pay P1,500.00 to Nicco for a Ukulele. Sioti is only giving P1,000.00 to Nicco. Nicco can refuse to accept the P1,000.00 because the fulfillment is not complete.