Corrigendum to "Belief functions contextual discounting and canonical decompositions" [International Journal of Approximate Reasoning 53 (2012) 146-158]

Proposition 4 and Theorem 1 of the article "Belief functions contextual discounting and canonical decompositions" International Journal of Approximate Reasoning 53 (2012) 146-158 provide an erroneous result. We give here the true result with a correct proof.