Hello Dave Hayward,
The error states that there is no such object i.e. you do not have a field named LabCode. Also if you are trying to use this field in the body of the crosstab, the expression in the textbox should be an aggregate.
If you're still having problems, please open a support ticket and attach a runnable sample where the issue can be observed. We would be able to provide more info once we review it.
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