Variable substitution issue (?)

Thank you, this was a useful tip to get started. I combined it with a question raised here:
www.xerte.org.uk/index.php/en/forum/wish...ulation-score-1#7139
It took me a while before I realized that the xenith stuff gets done first and if you want to use this to manipulate the actual values that get submitted, you'll need a 2 step approach.