Redefine a View via the Data Editor

How does one redefine a view structure within the Data Editor? I start by importing a set of fields from a DDM. In the context menu for the level-one entry, the Redefine option is deactivated.

My workaround is to create an in-stream view within the program editor and redefine the structure there. From the Data Editor I can then import the view and its redefinition from the temporary program.