Hi nlfs,
The 'user entered amount per pay period' option is when you (the user) will manually enter the accrual amounts when processing the pay run. However, if you would like the system to automatically accrue the leave hours, you will select one of the other options from the 'Calculation basis' dropdown: Equals a percentage of wages or Equals hours per pay period.
To get a better understanding of how entitlements work in MYOB Business, I'd recommend going through the below link:
Do reach out if you were still having trouble with this.
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