If you click edit XPath on my formula, you'll see: xdMath:Max(../my:group2/my:field1) - but on your formula, you have: xdMath:Max(my:field3). You need to go back up the tree so that you are getting the max of all items in your group. So - your formula would be: xdMath:Max(../my:group4/my:field3). Make sense? That's because you need to look at all the field3 values, not just the one for the current row.
Hilary Stoupa
