I have a repeating table with a drop down box inside. The drop down box is connected to a secondary datasource (XML file) which populates it. This fills the drop down box with Projects. I would like to be able to not select the same project twice. So when the user adds another row, the previous drop down selection will not show up in the next row. I have tried the not(@ = ../preceding-sibling::yada yada) but I can't seem to get it to work. Any ideas? Thank you very much.