Book One: 4 General Provisions
Part One: Felonies and Misdemeanours Title One: Scope of Application
Title Two: Criminal Liability
Art. 22
1 If, having embarked on committing a felony or misdemeanour, the offender does not complete the criminal act or if the result required to complete the act is not or cannot be achieved, the court may reduce the penalty.
2 If the offender fails to recognise through a serious lack of judgement that the act cannot under any circumstances be completed due to the nature of the objective or the means used to achieve it, no penalty is imposed.
EDIT.