Financing – Approach

Hello, I have a question regarding new car financing. The following facts: I have recently submitted an application to a bank and received a commitment. The bank needs the registration certificate Part II in addition to “normal” documents. But that doesn’t make any sense at all, right? The manufacturer will not give me the car (and thus the registration documents) until I have paid? But how should I pay if the financing amount is not too high? I pay 30%. Can anyone explain this to me? Strangely enough, the consultant couldn’t help me. He said it was normal. Thank you in advance!