Just consult the English version of the StGB: https://www.gesetze-im-internet.de/englisch_stgb/englisch_stgb.html#p0478 ;)

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Section 67b

Simultaneous suspension of measure

(1) If the court orders placement in a psychiatric hospital or in an addiction treatment facility, it simultaneously suspends the measure on probation if special circumstances justify the expectation that the purpose of the measure can also be achieved in this manner. Suspension is not to be ordered if the person still has to serve a sentence of imprisonment which was imposed at the same time as the measure and which has not been suspended on probation.