NX Chamfer and Edge Blend creates new incorrect surfaces on a hollow body

Have a hollow box with blended bottom edges to start with.

A chamfer is applied on the outside of a hollow box, (created with the Shell command) and is expected to produce an opening through the wall, but instead the chamfer and the inside edge blend forms a new volume with zero thickness at the expected opening edges.

How to overcome this?

If you have the intension to cut an opening through the shell by chamfer away a corner there are a couple of approaches which are suitable for this purpose.

Chamfer and Edge Blend is commonly applied to a large number of edges in a design. As a result of this, for performance reasons, these functions are designed as "local" operations, thus it will not take global interaction into account. NX does not turn on face-face self-intersection check internally running Chamfer and Edge Blend, which in this use case gives the ambiguous and invalid result.You could describe it as Chamfer and Edge Blend functions are basically designed to modify the edge between 2 adjacent faces and handling the complexity introduced in multiway corners and dimension transitions in conjunction with this.

- Use a 45 degree angled datum plane to trim the body with.

OR

- Use a sketch and extrude to do a boolean operation with (subtract), to cut away the corner.