You can only undo the last invoice for the client. Run a statement for the client and set it to show everything. See if there's anything unusual. If it seems to be okay you can try to rebuild the balance for the one client. MAKE A BACKUP BEFORE YOU START. Then go to data verification uncheck everything and check rebuild AR and choose only the one client with the issue. After you finish check the client. If it is correct great, if it is wrong restore the backup and call tech support or a certified consultant.
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