I've inserted a "DATABASE" field code in a Word document to display the results of a query, then I toggled the field codes and edited the SQL query so that less database columns are selected. I then updated the field codes and, as expected, only the selected database columns showed up in the results table. A few hours later, I repeated the same procedure on a new file but now every time I update the field codes I'm getting an "Invalid Merge Field" error popup.
Why is it suddenly doing this? How can I prevent it?