Error reports, corrupted data

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We have recently received a message saying data is corrupted on one of our five companies listed.  It seems that one customer has been duplicated - both accounts have same code OSOLE001 and exactly the same contents.

Also another customer has disappeared and message says the transaction has invalid sales account.  This missing customer and invoice means that we have a warning that the Sales Aged Balance disagrees with Debtors control.  The invoice is however listed in transactions under the .missing. customer sales account.

Are these fixable of will I have to use our last back up and re enter recent work.

Thank you