That is how it is supposed to work. You do not want an MPEG audio stream on DVDs or Blurays, you want either AC3 or PCM.

It's a feature, not a bug.

The "save as separate elementary streams" option is marked in the native template. But the audio is not exported. In order to work you have to do the above procedure and save as a new template. If it worked correctly you would not have to do that. So this is a bug to me. When I make a Blu-ray I export the video separate from the audio. Being the video in AVCHD or MPEG-2 Blu-ray and the audio in AC3 Pro. Only after that I do the editing in the DVD Architect. But I decided to make this post if someone had noticed this error and wanted a solution.

You can select the audio to be exported as you have shown, so still not sure why you think it is a bug. If you don't select the audio, then the "save as separate elementary streams" option saves the video only as an elementary stream. That is how that particular template is set up. It should probably just say "save as elementary streams".

The native template is set by default to produce two files: a M2V Video and an MPA Audio, but here it only renders the M2V video. Maybe it's a problem that happens only here with me.

It is not set to render two files because the audio option is disabled.

The native template is set by default to produce two files: a M2V Video and an MPA Audio, but here it only renders the M2V video. Maybe it's a problem that happens only here with me.

No, it's not just you. Others have found the wording confusing and misleading. One expects to get two files, M2V and MPA audio, produced from the template. But you only get the video stream. You need to manually do a separate export to AC3 or PCM. The template needs rewording to clearly state this.

Sorry for the lousy English. I'm using the online translator that sucks too. If the option "save as separate elementary streams" is enabled, two files should be created: one mpa audio file and one m2v video file. So why is only the m2v file created? Is it so difficult for someone to understand that?

In your example, you were rendering for Blu-ray. MPEG audio is not a legal audio format for Blu-ray disk. 

From Wikipedia: 

It was possible to use MPEG audio on DVD-Video in some countries.

From Wikipedia:

It's not difficult for me to understand what you're saying. Perhaps the development team should do clean-up on the Render-As template dialog box to remove the text that you referenced.

If you do manage to get a .mpa elementary stream, it won't make it through DVD Architect without re-encoding in the US.

Thanks john_dennis! Dvd Architect supports only the AVCHD and MPEG-2 video formats and the Ac3 Pro stereo and 5.1 sunrround or PCM stereo sound formats for Blu-ray. I always render my projects in these formats with separate audio and video. Doing so earns you time, since Dvd Architect does not need to recode anything else. I just found the case of this template curious and so I made the topic. But the right thing is to render the video and audio separate in the formats supported by Dvd Architect which are AVCHD and MPEG-2 for video and Ac3 Pro or PCm for audio. Thank you to everyone who participated in this topic.