服务插件的python代码，一直获取不到FMATERIALID，报错MATERIALlist中不存在FMATERIALID

import clr
#添加对cloud插件开发的常用组件的引用
clr.AddReference('System')
clr.AddReference('System.Data')
clr.AddReference('Kingdee.BOS')
clr.AddReference('Kingdee.BOS.Core')
clr.AddReference('Kingdee.BOS.App')
clr.AddReference('Kingdee.BOS.DataEntity')
clr.AddReference('Kingdee.BOS.Contracts')
clr.AddReference('Kingdee.BOS.ServiceHelper')
clr.AddReference('Kingdee.BOS.App.Core')
#导入cloud基础库中的常用实体对象（分命名空间导入，不会递归导入）
from Kingdee.BOS import *
from Kingdee.BOS.Core import *
from Kingdee.BOS.Msg import *
from Kingdee.BOS.Contracts import *
from Kingdee.BOS.Orm.DataEntity import *
from Kingdee.BOS.DataEntity import *
from Kingdee.BOS.Core.Bill import *
from Kingdee.BOS.Core.DynamicForm.PlugIn import *
from Kingdee.BOS.Core.DynamicForm.PlugIn.ControlModel import *
from Kingdee.BOS.App.Core import *
from Kingdee.BOS.App.Core.Messages import *
from System import *
from System.Data import *
from Kingdee.BOS.App.Data import *
from System.Collections.Generic import List
from Kingdee.BOS.ServiceHelper import *
from System import *
# 第二步：添加插件事件对应的方法
def OnPreparePropertys(e):
    e.FieldKeys.Add("FMATERIALID");
    e.FieldKeys.Add("FNumber");
def EndOperationTransaction(e):
    #这里获取单据数据包方式和前面一样
    for billObj in e.DataEntitys:
        billNo=billObj["FMATERIALID"];#单据编号

raise Exception(billno)

billNo=billObj["FNumber"];#单据编号

产品问题python操作列表服务插件，审核物料后，获取单据的FMATERIALID

产品问题 python操作列表服务插件，审核物料后，获取单据的FMATERIALID

恭喜您！

产品问题
python操作列表服务插件，审核物料后，获取单据的FMATERIALID