Security represents a crucial aspect in the development of Data Warehouses (DWs), since they contain confidential data. It becomes therefore necessary to specify security and audit requirements for the multidimensional modelling, that cannot be directly transferred to the relational model of the DW. The standard framework for software development Model Driven Architecture (MDA) allows us to define transformations between models by proposing Query/View/Transformations (QVT). This proposal allows the definition of formal, elegant and unequivocal transformations between Platform Independent Model (PIM) and Platform Specific Model (PSM). This paper employs QVT to establish a set of relations that allows us to transform security information embedded in the DW?s multidimensional conceptual model to a relational logical scheme.