Is the German Catholic church required to spend German donations in Germany, or can they e.g. reroute them to impoverished churches in South America? That coul

Is the German Catholic church required to spend German donations in Germany, or can they e.g. reroute them to impoverished churches in South America? That could explain some of the inflow/outflow discrepancy if you only look at Germany (one of the wealthiest countries in the world)