** Xchanging shares down more than a fifth to theirlowest since 2012 on concerns over the co's Procurement divisionand departure of its CEO
** Revenues at the Procurement unit, which accounted formore a third of the co's overall sales last year, fell 18.2 pct
** Co also took a 47 mln GBP goodwill impairment relating topast Procurement outsourcing activity
** Liberium cuts stock to "hold' from "buy" and more thanhalves its price target on stock
** Stock is by far worst performer on the UK small-cap index (RM: vikram.subhedar.thomsonreuters.com@reuters.net)
