Hi Martin,
Thanks for your reply. I've ready the whole "Navigating The BOPF" series a few times already, but I couldn't find anything helpful there.
After I posted this question (and before the first reply), I also ready the second blog post you mentioned. I had read it previously, but this time I found the comments about the "slave transaction management" that Tilmann referes below. I made a few attempts but also failed, so maybe with the proimeissed documentation I'll get there.
Regards,
Custodio