But this is also a proof that automation doesn't solve everything.

Exactly. A filter could be set up, for these amounts that can't be paid and find a solution, like you get a pass, till the next invoice and pay both then. But as everything is automated, this is where we are.

The funny thing is that we are blaming automation, but in fact it's the fault of the devs, who didn't take this into consideration when coding the app.

And I still don't understand why I can't pay in advance, just transfer 5 euro or 10 or whatever I can and solve it. Madness.