If it only shows that there was a conviction but gives not further information, it means that the case was expunged and the records sealed - in essense this means that there is no record of criminal behavior - it is as if the crime and conviction never happened.
I do not know the basis for your backgrnd check but if employment related persons who have had records expunged are not mandated to reveal the same.
That I cannot tell you as that would be a court code for administrative purposes - however, again if there is not any other listing - such as "Crimimal - shoplifting" or some sort of docket entries showing how the case evolved from beginning to end then that would be an expungement - only the clerk of the court is going to be able to tell you exactly what that code means.
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