I have a feeling this will be very simple but by throbbing head can't think how to do this.
I have a Table Box with many rows that is effectively order detail lines.
Each row has an order number and a position number.
The position number is not always 1,2,3,4,5. It can be 3,6,8,9,10 for example.
How can I get dynamically display in a separate statistics or text box the number of distinct order numbers selected in the Table Box?
