Remove obsolete attribute

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@2316 a333f486-631f-4898-b8df-5754b55c2be0

datamodels/2.x/itop-request-mgmt/datamodel.itop-request-mgmt.xml

@@ -1132,9 +1132,6 @@
               <attribute id="last_pending_date">
                 <read_only/>
               </attribute>
-              <attribute id="cumulated_pending_period">
-                <read_only/>
-              </attribute>
               <attribute id="time_spent">
                 <hidden/>
               </attribute>