Sickness Day falls on Annual Leave or Statutory Holiday
According to A Concise Guide to the Employment Ordinance - Chapter 5
http://www.labour.gov.hk/eng/public/wcp/ConciseGuide/05.pdf
Eligibility for Sickness Allowance
Which implied the employee is entitled to holiday pay even if the sick leave is taken.
In HRPro, the 1-day statutory holiday is excluded from the sick leave period when calculating Leave Days. And this one-day holiday is included in the Holiday Pay item on the Payroll.
So the Sickness Allowance is 4/5 of the past 12 months' average wages and Holiday Pay is 100% of the past 12 months' average wages.
This behavior can be overwritten if the option Statutory Sick Leave Days include Statutory Holiday (Recommend No) is turned on in Leave Module Setup, Sick Leave tab.
p.s. However, this eligibility does not apply to Maternity Leave.
See also:
check-box option Statutory Sick Leave Days count working days only in Leave Module Setup, Sick Leave tab
check-box option Full Pay Sick Leave Days count working days only in Leave Module Setup, Sick Leave tab
How to Calculate Leave Days in Leave Entry and Leave Application