Kepware

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"       }