Occasionally it may be necessary for a payroll system to modify or void a previously processed payroll document. As long as no documents have been delivered to employees, WFH integrators can modify a payroll by sending new payroll documents with the same eventDate, processingNumber and employeeID as a previously processed payroll document. The newer document will overwrite the older one and will be delivered to the employee on the eventDate. Once the eventDate has arrived, and documents have been delivered, re-processing payroll documents is not allowed, and any reprocessing attempt will be ignored. Note: It is possible to configure WFH to deliver documents in advance of the eventDate. In these cases, document reprocessing is only allowed up until the document delivery date, not the eventDate.