Unfortunately, there's not a specific section created in RA for tracking this if the pay varies but you do need to ensure that the employee's resulting net pay doesn't go below the PEA. If for instance, they work less hours & the standard CSA deduction will cause this to occur, you need to adjust the CSA deduction accordingly.
The following rate applies from 1 January 2019:
Weekly rate $372.53
(weekly rate x 2)
Four week period $1,490.12 (weekly
rate x 4)
Monthly period $1,619.84 (daily
rate x 30.4375)