I am having the same problem. I have a database with only two tables. One table containing names to populate the drop down list. The second table to write the name selected from the drop down list. I have a form with a drop down list and a text box (bound to the field in the 2nd table in the database). Populating the drop down list is without a problem. However, the text box field will NOT populate what I selected in the drop down list.
In the drop down list, I create a rule to set the field of the second database with the value of the selected drop down list "xdXDocument:GetDOM("Clients")/dfs:myFields/dfs:dataFields/d:Clients/@Name[@Name = current()]".
If I take out the [@Name=current()] then the text box will populate but repeats the same value over an over.
Any suggestion?