OS 514 then FR 9753 at Vienna
Bologna → Vienna → Banja Luka
Timetable, Vienna time
12:00OS 514 from Bologna at the gate
06:50FR 9753 to Banja Luka leaves the gate
18 h 50 apart on the timetable, overnight
FR 9753 leaves 18 h 50 after OS 514 arrives on the timetable: more than half a day, so not a connection we count.