No matter from which region or country you are transferring from, this include Germany, Europe or any SEPA country. The total blocked amount requires the €100 buffer amount. The buffer is meant to cover the unexpected expenses and fees that might take place.
For example, fluctuations in currency exchange rates, extra fees your bank takes for international transactions, etc..
By transferring the buffer together with the Blocked Amount you secure yourself and avoid the situation when unexpected fees and costs make the amount you transfer lower than the necessary amount for the creation of your Blocked Account. Thus, transferring a bit more at the very beginning can save you from the need to make a second transfer to cover up special bank/exchange fees later on.