Recht & Justiz
der schnelle Weg zu Ihrer Antwort
15 hours per week ist too much, it has to be less than 15 hs in order to maintain any unemploymente benefit.
See para 3:
However in the case of less than 15 hours, the benefit will be reduced depending on what you earned, 165 Euros per month will not be taken into account. see § 155 para 1: