[dba-VB] Adding an entity model

The entity modeler does not like nullable FKs.  IOW a location might / might not have an 
organization etc.

Generates copious errors!

Once I decided to go in and fix that, I had to delete the model and recreate in order to repair the 
"errors".  Just telling it to go fetch the latest from the database did not fix the "errors".  OTOH, 
deleting the entire model and rebuilding it did in fact get rid of all the errors.

What a PITA.
-- 
John W. Colby
www.ColbyConsulting.com