public Builder mergeScenarioExecutionStartingRequest(main.Messages.ScenarioExecutionStartingRequest value) {
        if (scenarioExecutionStartingRequestBuilder_ == null) {
          if (((bitField0_ & 0x00000020) == 0x00000020) &&
              scenarioExecutionStartingRequest_ != main.Messages.ScenarioExecutionStartingRequest.getDefaultInstance()) {
            scenarioExecutionStartingRequest_ =
              main.Messages.ScenarioExecutionStartingRequest.newBuilder(scenarioExecutionStartingRequest_).mergeFrom(value).buildPartial();
          } else {
            scenarioExecutionStartingRequest_ = value;
          }
          onChanged();
        } else {
          scenarioExecutionStartingRequestBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000020;
        return this;
      }