I am using v1.5 of SF. I go to the BO mapper:

1. Click on the Customize Wizard button.
2. Select the field(s) I want to modify (in this case, I am selecting all the string fields).
3. Set the option to "Set NULL Value Options"
4. Click on Return Alternate Value
5. Enter empty string
6. Click on Apply

When I do this, the wizard closes and no changes to the fields I selected have been made. Am I missing a step here?

Kevin