The visa requirement exemption applies only to holders of biometric passports (including holders of Serbian passports issued by the Serbian Coordination Directorate [in Serbian: Koordinaciona uprava]).
Obligation to hold a visa:
with regard to exercising gainful occupation (even if the occupation does not exceed 8 days within a calendar year).
Exemption to hold a visa with regard to exercising gainful occupation:
Holders of a longterm residence permit issued by a Schengen member state or a valid type D visa, provided they also hold a recognized and valid travel document.