If there are ghost special orders showing from the Required orders report, they may be from special orders that were deleted and something went wrong or the stock integrity routine did not find the invoice that the SO was created from and cleared out the invoice link but did not reset the SO status.
To remove them, please follow the instructions below:
1. Create a PO.
2. Click on the Orders tab.
3. Click on the Special Orders tab.
4. Select that ghost special order from the list and click on Add Special Orders.
5. Delete the PO by clicking Delete button at the top.
6. Run the Required Orders report. The special order should no longer show.