The visa requirement exemption applies only to holders of Hong Kong Special Administrative Region People’s Republic of China Passport (HKSAR Passport).
Obligation to hold a visa:
for holders of a Document of Identity for visa purposes containing under the heading "nationality" the entry "Chinese". In this case, the document is a Chinese passport (V).
Obligation to hold a visa with regard to exercising gainful occupation:
in the primary or secondary construction industry and civil engineering, catering and hotel services, industrial and private cleaners, surveillance and security services, and erotic services;
gainful occupation of any another kind, if such occupation exceeds 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 travel document.