How to redefine an offset work plane?

[azntwboy]

Hello,
I encounter problems of not being able to redefine an offset work plane in Inventor 2013.

The work planes are offset from the top face of a solid, which was created by one extrusion cutting another extrusion.
When I delete the extrusion making the cut, the work plane has the error "Coordinate system failure".

I try to redefine the offset work plane, and I get the prompt "Define work plane by highlighting and selecting geometry".
I try to select the "new" top face of the solid, and it highlights and turns blue, but that's all. It never completes the redefine.
If I hover over another parallel face, then it says "Click to create plane by two parallel planes".

What should I do?

Thanks

[Paul Munford]

Don't use the face of a feature to define your workplane. Define your workplane from the origin planes instead. Use named parameter values to control the height of the extrusion and the offset of the plane.

[azntwboy]

As a quick fix, I created 2 planes equal distance above and below where I need the redefine, and did a midpoint, like the prompt asks for.

[Bunny]

It seems you did not finish the steps. You still have to drag the new plane off in a specific direction and redefine the offset distance. Inventor will not choose the direction nor re-apply the offset value.