GENERAL PART
Chapter III.
Exclusion of penal liability
Article 28. § 1. Whoever commits an act while being in error as to a circumstance constituting a
feature of an prohibited act, shall not intentionally commit an offence.
§ 2. Whoever commits an offence in the justified but mistaken conviction that a circumstance has occurred, which constitutes a feature of a prohibited act carrying a less severe penalty, shall be subject to criminal liability under the provision regarding the circumstance warranting this lesser liability.
Mistake of fact - national proceedings
EDIT.