Converting SHP to Observation Set Points - free XYZ?

Is it possible to have a 2D shape file, but with a column for elevation, and convert it to and Observation Point Set using a free XYZ position?

What i have done so far is:

- imported the point set via the Map dialog
- Select "Convert to Observation Points" in the context menu of the map
- Specified the Elevation column as Z  (X and Y are intrinsically taken from the shp file geometry)
etc and hit ok.

I did not get any errors, but there are no observation points when i did this.  Alternatively, if i randomly chose a slice rather than free XYZ, then this adds observation points from the map file, but this is not what i want - i do not have slices for each obs point, only an elevation.

Any ideas?

Udju

Can anyone help? It apparently is converting them correctly as I can see them in the list of observed points, I just cannot see them on slice view.

I can see them in 3D view, so thats fine.  However, there is no option to see the scatter plot in 3D view.