function onConfirm(sCode) {
				var bNonTransient = !oItemContext.isTransient();

				if (sCode !== 'OK') {
					return;
				}

				oItemContext.delete({groupId : "$auto"}).then(function () {
					if (bNonTransient) {
						MessageToast.show("Deleted sales order item " + sSalesOrderLineItem);
						oTable.clearSelection();
					}
				});
				if (bNonTransient) {
					that.readSalesOrder();
				}
			}
Clears persistent or technical messages from the message model.

@param {boolean} bUnboundOnly Whether only unbound messages are removed