Systems and techniques for extending data flows are thus described. In one aspect, an article includes one or more machine-readable media storing instructions operable to cause one or more machines to perform operations. The operations can include receiving extension information identifying an extension of a first object in a data processing system landscape, accessing data flow information to identify one or more data flows that involve the first object, and extending, on the basis of identifying the one or more data flows as involving the first object, at least some of the one or more data flows so that information in the extension is conveyed between instances of the first object and instances of a second object during data processing in the data processing system landscape. The identified data flows convey stored information from one object to another.