MYOB and payroll category

This payroll system is possibly the worst on the market when it comes to removing payroll categories. In short, you can't remove them, so an employee who is on an award and changes pay categories ends up with a lengthy list.

For every wage group, there are different categories for public holidays, shift work, and more. 

Consequently, every pay rise results in a new set of categories, leading to errors and incorrect payments.

I understand the need for stability during the year to prevent payroll corruption, but surely changes could be made between the last payroll of the current year and th