I am trying to get the inventory details of the item from VRMA record ,i am getting error ""name":"OPERATION_IS_NOT_ALLOWED","message":"The subrecord line has already been committed or cancelled". The API i used is

 var inventoryDetails = VrmaItemRecLoad.getSublistValue({ sublistId: 'item', fieldId: 'inventorydetail', line: lineNum });

 var invREc = record.load({

              type: record.Type.INVENTORY_DETAIL,

              id: inventoryDetails,

              isDynamic: true,

            });

I need to access all the inventory details of all the line items in VRMA record . Can somebody help me to get the values of inventory details.