Соответствующая норма
Practice Relating to Rule 67. Inviolability of Parlementaires
Serbia’s Criminal Code (2005) states:
Whoever in violation of international law in time of war or armed conflict abuses, mistreats or detains a bearer of a flag of truce/emissary or his escort or prevents their return or otherwise infringes their inviolability, or orders such acts committed, shall be punished by imprisonment of six months to five years. 
Serbia, Criminal Code, 2005, Article 380.