text: Bill, the last sentence of your post confuses me.  You write that (1) the Church has declared the Anaphora of Addai and Mari to be sacramentally valid; (2) the Anaphora "does not literally recount the words of Christ at the Last Supper---i.e., the Words of Institution; (3) the Words of  Institution are essential to effect transubstantiation.  (1) (2) and (3) cannot all be true together.
  Why? If the Words of Institution are essential to efffect a transubstantiation and the Anaphora of Addai and Mari don't contain them, then the Anaphora does not effect a transubstatiation.  But if the Anaphora does not effect a transubstantiation, it cannot be sacramentally valid.
  I'm pretty sure, though, that the Church held that the Anaphora DID contain the Words of Institution.  Although not in "coherent" form---"coherent" being used to mean "all together in one place" rather than the conventional "understandable".  Logic problem solved?