ACC: BeforeUpdate and AfterUpdate Field Properties Not Working

MORE INFORMATION

Steps to Reproduce Behavior

1. Open the sample database Northwind.mdb (or NWIND.MDB in Microsoft Access 2.0 or earlier).
2. Create the following macro called TestCityForNull:
   

        Macro Name       Condition        Action
        ----------------------------------------
        TestCityForNull  IsNull([City])   MsgBox
                         ...              CancelEvent
   
        TestCityForNull Actions
        -------------------------------------
        MsgBox:
           Message: City Is A Required Field!
   						

3. Create the following macro called SetCityToNull:
   

          Macro Name      Action
          --------------------
          SetCityToNull   OpenForm
                          SetValue
   
          SetCityToNull Actions
          ---------------------
          OpenForm Action:
             FormName: Customers
             View: Form
   
          SetValue Action:
             Item:[Forms]![Customers]![City]
             Expression: Null
   						

4. Open the Customers form in Design view and select the TestCityForNull macro in the City control's BeforeUpdate property.
5. Run the SetCityToNull macro. Note that it successfully blanks out the City field (you can press ESC twice to get it back). If the control's BeforeUpdate event had been triggered, the TestCityForNull macro would not have allowed the field to be blank.
6. Try to blank out the City field manually. The TestCityForNull macro will be triggered, displaying the following message:
   

         City Is A Required Field!
   						

7. Do not save changes when you close the Customers form.