Article 779. Reciprocal obligations

(1) An obligation of a person is reciprocal in relation to an obligation inuring to another person in one of the following situations:
a) performance of the obligation is due in exchange for performance of the other obligation;
b) it is an obligation to facilitate or accept performance of the other obligation;
c) it is so clearly connected to the other obligation or its subject matter that performance of the one can reasonably be regarded as dependent on performance of the other.
(2) Reciprocal obligations may arise under contracts (synallagmatic or bilateral contracts)  and under other grounds of obligations.

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Annotation:
Origin of the regulation: Article III. – 1:102(4) DCFR