erp5_mrp: get ledger from movement

bt5/erp5_mrp/PathTemplateItem/portal_deliveries/manufacturing_execution_builder/category_movement_group_on_delivery.xml

@@ -48,6 +48,7 @@
                 <string>specialise</string>
                 <string>ledger</string>
                 <string>price_currency</string>
+                <string>ledger</string>
               </tuple>
             </value>
         </item>