BOOK I
GENERAL PART
TITLE II
ON CRIME
CHAPTER I
GENERAL ASSUMPTIONS
Article 17. Error regarding circumstances of the act
1. Error regarding elements of the law or acts related to a legally defined crime or prohibition that would reasonably be considered essential for the perpetrator to have knowledge of in order to comprehend the unlawfulness of the act excludes intent.
2. The system described in the previous subarticle includes error regarding existence of assumptions of a cause for exclusion of unlawfulness or guilt.
3. Negligent conduct shall be punishable whenever provided for by law and the respective assumptions are present.
Mistake of fact - national proceedings
EDIT.