datagrid不能编辑怎么回事

/表格定义部分
 $("#goodslist").datagrid({
 width: width,
 nowrap : false,
 rownumbers : true,
 singleSelect : false,
 url : "dutyManageAction!queryAllDuty.action",
 method : "post",
 pageSize : 20,
 striped : true,
 pagination : true,
 fitColumns : true,
 idField:'ID',
 remoteSort:false,
 editable:true,
 columns:[[
       {field:'LEADER',title:'带班',width:fixWidthTable(0.10),sortable: 'true',
           formatter: function(value, row, index){
               if(value == '[object Object]'){
                   value = "无";
               }
               return value;
           },
           editor:{
               type:'combobox',
               options:{
                   valueField:'USER_NAME',
                   textField:'USER_NAME',
                   url: 'dutyManageAction!queryAllUser.action', 
               }
           },
      },
              
    ]],
 });<span></span>

带班这列没法编辑啊，