title: How do I remove an Expression from a variable in SSIS?
body: <p>I have an SSIS package* built in BIDS 2008 with a variable whose value was originally being evaluated as an Expression. We now set the value in a different way, but I can't for the life of me figure out a way to remove the (now invalid) Expression from the variable without mucking about in the XML.</p>
  
  <p>I've set EvaluateAsExpression to False but I can't just delete the Expression. I'm able to select and copy and the text directly from the Properties window, but I can't edit or delete it from there. Clicking the ellipsis to open the Expression Builder screen will let me modify it, but clearing it and clicking OK gives me an 'Expression cannot be evaluated' error.</p>
  
  <p>Am I being obtuse or is this yet another thing that doesn't quite work in SSIS?</p>
  
  <p>* now I have two problems</p>