The visa requirement exemption applies only to holders of biometric passports.
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.
