Get error when update Category B folder in Pay Master

When try to modify Assign Pay and Deduction Types for Category B folder for pay type 502, getting the following error when try to add pay type 601 to the pays list: Category 'A' Pay Types must have a smaller Pay Code number to be included.

• Enterprise ERP Payroll

• Pay Master

• Pay Type Category code

Pay type 502 is Category B pay type.  Pay type 601 is Category A pay type, and is sequentially higher than 502

When process a payroll, the pays are processed in order.  You cannot determine 502’s amount until you know 601s hours, but 502 will be processed prior to 601.  To include a Category A in a pay code, the Category A pay code needs to be sequentially lower than the Category B pay.