When you receive Oracle Payroll, some formulas are predefined in your system. You cannot make any changes to these formulas, but you can copy them and modify the copies.
Note: You can associate several formulas with a single element, each one for use with a different employee assignment status. You can also use the same formula for more than one element. In this case, if the formula references pay or input values (through the Inputs statement), each element must have pay and input values with the same names.
Writing Formulas for Element Skip Rules
Using Oracle FastFormula for Validation
Accessing Input Values in Payroll Formulas
Writing Efficient Payroll Calculation Formulas