The Warehouse App Task Validation (WATV) is a useful addition to the RSAT implementation for the automation of the MDE processes. Currently the WATV page in DFO can only be used in the English language (user profile settings). If you have set another language, e.g. German, you will get an error message (Object reference not set to an instance of an object) after finishing the recording. 

Since the task recordings for RSAT can be recorded in any language, it should also be possible to operate WATV in other DFO languages than English.