56It is true that a Member State may check whether an undertaking established in another Member State and which posts in its territory workers who are nationals of a non-Member State is not availing itself of the freedom to provide services for a purpose other than the accomplishment of the service in question, for instance, that of bringing his workers for the purpose of placing them or making them available to others (see Rush Portuguesa, paragraph 17, and Commission v Luxembourg, paragraph 39). However, the EU Posting Confirmation procedure cannot be regarded as an appropriate means to attain the objective relied on by the Austrian Government.