In order to handle complexity, model driven engineering aims at building systems by developing several models, where each model represents a specific concern of the system. In this context, designers need mechanisms to validate, synchronize and understand interactions between those perspectives. Model composition deals with these issues but remains a complex task. For these reasons, we believe that a strong traceability mechanism is a key factor to handle relationships between models and manage the complexity of the composition operation. This paper describes a generic approach to keep track of the model composition operation. We also define a traces generation process to adapt our proposal to any specific composition language. Finally, an example is presented to illustrate our contributions.