Check the pay element's settings
In order for the pay element to show when adding additions or deduction, you will need to ensure that the Allow in HR box is ticked.
Go to Setup and click Settings.
Click Module Settings, then Payroll Settings.
Select Pay Element.
Search for the pay element and click it.
Tick the Allow in HR box and click Save.
Check if this Payroll is added on the pay element
Go to Setup and click Settings.
Select Module Settings.
Click Payroll Settings and then Pay Element.
Search for the pay element and click it.
In the Grades section you will see the first column, called Payroll. If the employee's payroll is not added in this list, you will not see the pay element when adding an addition to basic pay for them.
Click Add Grades.
Select the payroll, negotiating body, grades and pay scales and click Save.
Click Save.