YES! Thank to all of you whom post advices, I managed to return and end my patrol! Now it feel so much better, since I can finally submerge my fully repaired submarine while re-arming her fully.
From now on, if I need to return to re-arm or ending patrol, I will not report the patrol being completed to commanders.
And like I said, I thank to all of you for these useful advices!
Chaoic out...