code: function (oGroup) {
  				var sTitle = "{i18n>systemData}";
  
  				if (oGroup.key === "custom") {
  					sTitle = "{i18n>externalReferences}";
  				}
  
  				return new GroupHeaderListItem({
  					title: sTitle,
  					upperCase: false
  				});
  			}
docs: Factory for creating list group header objects for the metadata list.
  @param {Object} oGroup - group data passed from the lists model binding
  @returns {sap.m.GroupHeaderListItem}
  @public