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I have tried updating the framework (1.6.6 released version), then I tried updating to the most recent DevEx version (8.2.4).  I have removed the grid and replaced it with another instance.  All attempts have resulted in the same behavior.

Does anyone have any idea why the XtraGrid is causing this error to popup?  Btw, I can answer 'No' and continue using the form.  I'd really like to use the XtraGrid rather than the EnhancedList (which is nice, but lacks a couple of necessary features). 

Thanks for your help!
Bill

. . . to this . . .

. . . and the error occurs.  I do not understand.  The column should evaluate as null, therefore return a value of zero.  Why does this error?  What if all I wanted was to list the movie titles (SELECT mv_Title FROM Movies) and display the results in a grid, would this not be a valid query since custom properties are involved in the BO?  Should I always have to fill the custom properties with something (SELECT mv_Title, 0 AS ItemCount FROM Movies) even if I am not going to reference the custom property(-ies), or any other property (e.g. mv_Year, mv_Rating, etc.)?

YOU MUST either pull back a value from the server as a column that represents the custom property you are trying to pull (ItemsCount) or perform some type of calculationo with the data that you did pull back...using your query YOU DO NOT HAVE A COLUMN named ItemsCount that can be accessed from the CUrrentRow of the BO!!!!!