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The entity created using the code above does not contain those extra fields, so it will throw an error when it tries to process them.
As the Entity Spaces documentation states, you have to put the following code into your code-behind to allow it to do this: field values back to be saved, including the extra fields.
So you need to attach a ASPx Grid View Custom Callback Event Handler to the ASPx Grid View in the ASPx Grid Lookup control on init.
Do that like this: The Situation: You have a Dev Express ASPx Grid View on your page with a column designated as “Read Only=true”.
Here is an ASPx Grid Lookup control on an aspx page: Now to make this work, you have to do two things in the the code behind.
(1) The ASPx Grid Lookup control contains an ASPx Grid View inside it (that’s what makes it such a valuable control).