Hi Polly,
Error 4102 represents corrupted data. Please do a backup of your data, then run a data integrity check (DIC). If errors are found, you may choose to run the Rebuild function within DIC to attempt to fix the errors. This may fix your cash batch or may remove the entries - and you have to re-enter them.
This error has been known to occur if Opportunistic Locking is enabled on the workstation, or there is a hardware fault.
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Regards,
Softrak Tech Support