A placed order can be cancelled free of charge under "Transactions" if it has not yet been fully executed. A direct modification of an order is not possible. If you want to change an order that has not yet been executed, cancel it and set it again.

According to the 
Conditions for Transactions on the Munich Stock Exchange (IV. Section), trades can be cancelled retroactively by the exchange under certain conditions. This applies in particular to so-called mistrades. Mistrades can, for example, be caused by technical malfunctions or an obviously deviating reference price. In the event of a cancellation of your already executed order, you will be informed by e-mail. Limit or stop orders will not be reactivated. Therefore, if necessary, please place the corresponding order again.