Make sure there is enough money in the account from which the value of your orders plus service costs are to be deducted. If there is not enough money in this settlement account, you cannot place the order.
Do you want to set up a periodic order? Then there must be enough money in the settlement account for every period. If this is not the case, the periodic deposit is not executed at that time. If there is enough money the next time, the periodic deposit simply continues as before. The linked settlement account is usually the Investment Savings Account or your current account, which you will find in your account overview.