Issue #661606 by MegaChriz, twistor, Cottser, scottrigby, manojbisht_drupal, Mohammed J. Razem, agileadam, emilyf, tmsimont, bradjones1, hairqles, ldavisrobeson, selim13, a.ross, chromix, g089h515r806 | lunk_rat: Added Support unique targets in mappers.