Difference between Absence Payment rule and Accrual Liability

Summary

Difference between Absence Payment rule and Accrual Liability

Content

On creating an Absence Plan in the Entries and Balances tab we have Absence Payment Rule and Liablity Rule.As per my uunderstanding Absence Payment rule
should be selected only when the Absences are paid. Say for example if a worker raise an absence for singhe day then based on the rate defined at Absence payment rule 
the Payment for that single Absence would be done. If have gone through he implemetation guides but still not clear on the Liablity Rule.

It simply says that an employer's liablity to pay . Can anyone please help me in understnading this. The reason I wnat to understand is if we are creating and