1. A method of updating object data with respect to object specifications in a product life cycle management (PLM) system that includes objects, dependence relations between objects and object specifications, the method comprising: in a hardware processor: building a directed graph that includes nodes and arcs, wherein: nodes of the graph represent respective objects of the PLM system; and a first arc of the graph is directed from a second node to a first node, the first node represents a first object of the PLM system and the second node represents a second object of the PLM system, the first object depending on properties of the second object according to a dependence relation of the PLM system, the first object having object data; and updating, in the PLM system, the object data of at least the first object based on changed object data of the second object and object specifications of the PLM system by browsing the graph according to a direction of the first arc.