Retrieving information from xml to domain mapping

Hi All,

I am using xml to domaing mapping to get information from xml message. When I upgraded my project from 4.7.1 to 5.21.5, I got extra entity  ChoiceBase (Please see the screen shot of mapping).

Now it doesn't allow me to associate entity ns_SeqA to any entity. Would you please let me know how can I get this entity.

In 4.7.1 Modeler :

In 5.21.5 Modeler :

It is mendatory to me to select the choicebase to select the other elements.

Thanks 

Abhinay