Hi R@S, let me put it in images and with a timeline... (i dont have saves before sorry)
I received the mission to trasnport a breifcase and the warning that some enemies could try to attack me.
Some enemies attacked me, but, in the start of the battle my main character appears in a dialog and says "i have to capture the leader alife to interrogate
him", believe me there are no enemy marked "Leader" but at the end i found him and leave him alive until everyones elese was dead and he surrenders. He told me the contents of the briefcase.... and then i went to a trader
after that the log of the mission shows
(here i posted my question in the forum)
afterwards i continued playing.....
looking for a "buyer" i take some days... and then the log changed:
well, i went to the mayor and confront him
again a very hard fight because the character who talks with the mayor have 7 soldiers in front of him

.....
well i killed them all (al the city guards went hostile)
and the mission was failed and the log shows:
Thanks for the help, and sorry for my english and the possible spoilers....