Preliminary -- general premise -- Generic requirements for a claim in enrichment -- Condictio causa data causa non secuta -- Condictio ob causam finitam -- Condictio ob turpem causam -- Condictio furtiva -- Actio negotiorum gestorum contraria -- action resulting from unauthorised administration of another's affairs -- Condictio indebiti -- the claim for indebite payment -- Condictio sine causa.