Issue
In MYOB Advanced with WorkForce Management (WFM), you may not be able to onboard casuals under the pay rates instead of pay levels.
This is a limitation in the software that you can't onboard casuals under pay rates and not pay levels
Workaround
As a workaround, use the rate during onboarding and change the employee to pay level when the employee is created in WFM.
You will need to make the pay rate value 0 for the pay level to work.