Writing Value to KEPWare Problem

I used OPC DA Server to connect KEPWare to Thingworx, I can read Item values, and I can use KEPWare client to write item value,

but I can not write value to items in Thingworx even if I set item ReadOnly true.

    {

        "BaseType": "INTEGER",

        "Name": "TemperatureUpperLimit",

        "ReadOnly": false,

        "Source": "Channel1.Device1.MyFBox.S7-1500.Item00.温度下限",

        "SourceType": "System.UInt16"

      }