You can give access to the change basic pay button for commons reasons such as:
Adjusting an employee’s salary for example after a pay review or promotion.
Adding a new salary line with a new effective date.
Updating pay details such as grade, payscale, contract days, or contract hours.
You can give access to the change basic pay button if you assign the Salaries permission. The employee will need to be given the view 
and add
permissions to be able to use the button.
🤓Tip: No strikethrough means enabled, strikethrough means disabled.