Significant change in the section "Visa categories and the requirements of supporting documents" - for F Visa (this must have been only up-dated in the last days):
2. F visa for business and visit (updated from April,2008)
To apply for single or double entry business and visit visa
(1) "Visa Notification Form" issued by the relevant department
of Chinese government or the government-authorized company;
(2)A copy of Chinese hotel booking;
(3)A copy of return flight ticket booking;
To apply for multiple-entry business visa, "Visa Notification Form" issued by authorized Foreign Affairs Office or Bureau of Commerce(original),together with Hong Kong Permanent ID card (original and photocopy) and other possible supporting documentation( Registration Certificate of your company in China, etc) are needed. Multiple-entry visa is issued at the discretion of the consular officers.
Added is the part "To apply for multiple-entry business visa"
Having the "visa notification letter" + "PERMANENT HK ID" but maybe no "other possible supporting documentation" (above named "Registration Certificate of your company in China") - the multiple F visa application can / will be denied. So we all need to become "tourists" now and contribute to the HK travel agency industry.
This kind of requirements was even not necessary 20 years ago - Cheers !
But then the link on same webpage "Additional information" should be up-dated also - right ? http://www.fmcoprc.gov.hk/eng/zgqz/qtxx/default.htm