Possible Resolution:
Have all users exit Sage MAS 90 or 200 for the affected company, and recalculate account balances.
If the error persists, reboot the workstation, and then recalculate balances. If necessary, reboot the server, and then recalculate balances.
https://partners.sagenorthamerica.com/irj/go/km/docs/sageKM/Sage%20MAS%2090%20and%20200/Gated%20Customers/Warr_Svc_Support%20Plan/503144.html