Resolution
- Select Start, Control Panel, and then select Programs and Features.
- Right-click Sage 50 Accounting, and then select Change.
- Click Yes at the message "Continue modifying Sage 50?"
- Click OK on the message "You currently have Sage 50 installed."
- Select Update/Reinstall option. Click Next.
- Reboot computer.
- Verify you no longer receive an error message when adjusting or voiding an invoice.