client is trying to snap PUTCALLIND field (109 field id) for the RIC S1R955U3 and they are gettin...

Hi @lyka.bulawan,

RFA sample code shows how to get data and ignore InvalidUsageException in the StarterConsumer code which ships with the RFA.NET SDK package.

// Decode Payload
if ((respMsg.HintMask & RespMsg.HintMaskFlag.Payload) != 0)
{
  ThomsonReuters.RFA.Common.Data payload = respMsg.Payload;
  if (payload.DataType == DataEnum.FieldList)
  {
    FieldList fieldList = payload as FieldList;
    Console.WriteLine("FieldList's entry count: " + fieldList.StandardDataCount);
    short fieldId;
    foreach (FieldEntry fieldEntry in fieldList)
    {
      fieldId = fieldEntry.FieldID;
      try
      {
        RDMFidDef fidDef = rdmFieldDictionary.GetFidDef(fieldId);
        ThomsonReuters.RFA.Common.Data dataEntry = fieldEntry.GetData(fidDef.OMMType);
        if (dataEntry.DataType == DataEnum.DataBuffer)
        {
          DataBuffer dataBuffer = dataEntry as DataBuffer;
          Console.Write("\tFieldEntry: {0,-10} {1,-8}\t", fidDef.Name, "(" + fieldId + ")");
          Console.WriteLine(dataBuffer.GetAsString().ToString());
        }
      }
      catch (InvalidUsageException)
      {
      }
    }
  }
}

Seems like user is not familiar with the basics of market data delivery. The image response (very first one) contains all the fields which are associated with an instrument, the consecutive updates will only contain the fields that have changed since the last update.

So in simple words, they will not receive every FID in the update message.