Thanks for your help. I'm not sure exactly how to explain the problem I'm having...

UseValueAsLabel was already False. In the label property, I had #PERCENT{P0}, otherwise the labels would show the count for that particular category.

My DataSet1 has a query that groups 6 categories and counts each row in a column. For example:

total totalValue category categoryValue

1 1 Existing 100000000

10 10 New 100000001

13 13 Growth 100000002

etc, etc.

In the chart data, I have [total] in the Values area (no aggregate function used), and category in the Category Groups area. Everything previews great.. I just don't want to show slices under 10% because the chart is quite small and so the labels overlap when they're under 10%. When I try your expression, I get #Error (rsAggregateOfNonNumericData) for the labels (I put your expression in the label property).