public Builder setStepValidateRequest(main.Messages.StepValidateRequest value) {
        if (stepValidateRequestBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          stepValidateRequest_ = value;
          onChanged();
        } else {
          stepValidateRequestBuilder_.setMessage(value);
        }
        bitField0_ |= 0x00000400;
        return this;
      }