An operator realised that after correcting a commission amount, the commission's available date was incorrect. When a commission is made available, the available date is set according to the computer's system date in Windows. The date cannot be manually changed.
Solution: The first task is to remove the commission items from the salesperson's invoice so that they can be made unavailable and then available again with an adjusted Windows system date. The invoice must be uncompleted first if necessary.
Then adjust the computer's Windows system date and time to the desired available date, and open the sale record in OfficePartner. Click Make Unavailable to make the commission items unavailable, then click Make Available to apply the correct available date.
Back in the salesperson's invoices tab, select the invoice and click + to add the commission items back in. Here you can confirm that the Available date is correct.
Notes: For this scenario the change was performed in a lab virtual machine so that we could restore the data into the production environment where a system date change was not allowed. In a Hyper-V virtual machine, you'll need to uncheck Time Synchronization in Settings > Integration Services to stop the VM's time from reverting back automatically when you attempt to change it.