Cannot set StructuralFeature field in ReadStructuralFeature Action

[mse]

According to the EA documentation, all you have to do is the following:

• Right-click on the Action element and select 'Advanced | Set Structural Feature: Add'.
  On the 'Select Property' dialog (a variant of the 'Select <Item>' dialog), browse or search for the appropriate structural feature, and double-click on it.
  
• The feature name and location displays in the 'structuralFeature' field of the 'Set Structural Feature' dialog.
  Click on the OK button to save the setting.

However, when I follow those instructions to the letter, nothing apears in the structuralFeature field of the dialog box.