If all adjoining edges of a face have been edited by the Blend feature, the function Generate sketch on selected face cannot be used on this face anymore. This can be recognized by the missing display of coordinate systems.^[84]

Example:

All 4 edges edited by Blend feature: "Generate sketch on selected face" is not applicable in this situation

If at least one "free" edge exists, the function Generate sketch on selected face can be used.

One "free" edge

If one edge is edited by sketch and the other 3 by Blend feature, the function Generate sketch on selected face can be used.

One edge edited by sketch