Create Conversion Formulas for Proration
The predefined proration formula GLB_EARN_PRORATION controls how the payroll calculation prorates an element entry when it encounters an event. This could happen when there's a change to an element entry value.
You can copy and edit a predefined proration formula to modify the calculation. Then, you can select the user-defined formula as the proration formula for your element.
Create a Formula
You must create a modified rate conversion before you create its related proration conversion rule.
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               Select the formula type Payroll Run Proration. 
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               Search for and copy the predefined Rate Conversion Proration formula. 
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               Add the suffix underscore _PRORATE to the name. 
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               Update these formula inputs: - 
                     PRORATE_START_DATE (date) 
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                     PRORATE_END_DATE (date) 
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                     SOURCE_PERIODICITY (text) 
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                     DAYS_WORKED (number) 
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                     RATE_CONV_FORMULA (text) 
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                     HOURS_WORKED (number) 
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                     IN_AMOUNT (number) 
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                     UNIT_TYPE (text) 
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                     PRORATION_UNIT (text) 
 
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               Add the formula outputs for the element input values. 
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               Save, submit, and compile the formula. 
Some countries or territories supply predefined proration formulas that you can use as the basis for your modified version.