Rowediting rejecting changes made to a field that was not defined in its model class

Hi,

I have a grid with the "rowediting" plugin. When I edit a cell that represents a field that was not defined in its model class, the changes are rejected.

http://ift.tt/XsiMCI

Since ExtJS 5 supports models without defining their fields because it auto-generates them based on the data, shouldn't the "rowediting" still work in this case?

Thanks

Rowediting rejecting changes made to a field that was not defined in its model class