The RPN number is a field included on the Revenue Payroll Notification. This is applied by Revenue and tells the software if there has been an update to an employee’s credits etc. If an updated RPN is available, the RPN number for that employee will be incremented.
The RPN number for each employee is subsequently included in the periodic payroll submission to Revenue, so Revenue will know if the employer is using the latest RPN available for an employee or not.
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