flex 4中的冲突错误

Question

Good am stackoverflow ...我在更新我的flex项目时遇到问题... 当我在第一次运行时对某个对象进行更新时，这是正常的但是在第二次运行时它给出了一个IT冲突错误，这是错误

mx.data::Conflict {
  cause = mx.data.messages::DataMessage {
    body = [["lessonid"],
    {
      lessonid = 8
      lessonplanid = 1
      status = "active"
      studentid = 1
    },
    valueObjects::Lessonplan {
      lessonid = 9
      lessonplanid = 1
      status = "active"
      studentid = 1
    }]
    clientId = null
    correlationId = ""
    destination = "lessonplanRPCDataManager"