Hi Pepe,
it is possible! I use that in daily work for a long time.
Your problem is propably caused by the fact, that you do not use the monitor path as a dedicated seperate output feeding your monitors.
As long as you do not use it, the solo function will interrupt your aux feeds, because it works as a "solo in place" which goes on to your stereo master bus. That means every channel which is not involved will be switched off by pressing a solo button, except the belonging effect returns. That kills even your headphone mix.
In postproduction it could be quite attractive using the stereo bus as listening source, because it achieves listening even the dedicated effect returns of your soloed channel. In a tracking situation it disturbs your headphone mixes of course.
So, if you use the monitoring path of samplitude it won't interrupt your headphone outputs any longer.
By the way which version do you use?