Fill column A B with row number, fill comments of column B with 7
Make a scatter plot
Open axis dialog, go to reference line tab, open details dialog
Add one reference line at %(1Y,@LC), apply ? reference line shows at 7
OK with axis dialog, then reopen axis dialog to check reference line ==> value is 7, no info about %(1Y,@LC)
Change value type to expression, at axis value at %(1Y,@LC) ==> no reference line shows in graph