Just noticed I didn’t address this aspect fully in an earlier reply. My 22 Ducato cab door re locks if I had unlocked those doors but not opened one but if I unlock and open the pvc side or rear door it does not auto re lock them.It's not an alarm problem.
On some Ducatos , mine has keyless entry, the doors will automatically re lock if a cab door is not opened within 1 minute of unlocking. Unfortunately opening the hab door doesn't register with the Ducato electronics and the doors relock automatically.