The input tuple that generated the exception during the mapping execution is then shown.

The exception was generated while calling the "ExtractPages()" external function in the body of mapReDa. Indeed, this function (Java method) does not know how to automatically choose the pages between "316--327" and "23-25".

The user may choose to correct the exceptional tuple by hand such that the exception is avoided during the transformation execution. She does that by clicking on "Update"