what RAV wants to do, always: get you off their paycheque list. hence they want that you look for a job that covers the period until you start your new job.
thats rarely working, but it could be that you do. and for that anything goes: night portier 60% at a hotel, filling clerk at Migros... zwischenverdienst is the buzzword you should check up what that means. if any RAV agent is letting you off the hook... fine, lucky punch. its not the rule.