I've changed some property names to friendly names using custom code option in Business Object Mapper.

(Plus override GetCustomBindablePropertyDescriptors for these fields)

I've noticed that when this object was bind to a Devexpress Grid with business binding source, these properties were not seen in Devexpress Grid.

I've tested for Devexpress (Wrapped) Textbox. These fields were listed in the BindingField list of the textbox.

What is missing ?

What does the declaration of your BO class look like?  In the GetCustomBindablePropertyDescriptors method, you are using the type of CompaniesBase, is this the class that your custom properties are defined within?  There is really not much that has to be done....if you have type descriptors create or have them defined in the GetCustomBindablePropertyDescriptors method, they should show up.  What does your BO Mapper settings for one of your custom properties look like?  Do you have any other options checked, like the Create Descriptor?  If so, then this is probably your issue.  You do not need that checked since you are defining the GetCustomBindablePropertyDescriptors.