voraussetzen = require In order to gain initial (erstmalig) access to the holding of a blocked account, it is required at the time of opening the account, that the holder (Inhaber) signs a special (gesonderter) contract of service in an investment or financial centre of the bank in Germany. Sperrkonto = an account where you can only access the funds after a certain period. I have forgotten the word we use in English for these.

In order to enact access for the first time... (this only applies to establishment of frozen accounts) the account holder has to sign a service order... at the investment- and finance-center of the bank... in Germany