[protobuf] How to avoid error C2662 on nested messages

[Barzo]

Hi,
I have messages defined as:

message MsgHeader
{
  required EMessages  opCode        = 1;
  required int32      sessionRef    = 2;
  optional int32      transactionId = 3 [default = 0];
  optional int32      status        = 4 [default = 0];
}

message MSG_EVENT_METHOD_STATUS
{
  optional EMessages    opCode      = 1 [default = 
E_MSG_EVENT_METHOD_STATUS];
  required EMessages    opCodeSent  = 2;
  required MsgHeader    header      = 3;
}

In my code, when I wanna set the header params, I get the compiler error 
C2662 because the header() method is const.
So I cannot do something like:

MSG_EVENT_METHOD_STATUS msg;
msg.header().set_status(0);

Is there a way to avoid this or I have to make a const_cast on the header()?

BR,
Daniele.

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