#19 run-time selection of surface interpolation scheme ignored?

[Pfiffikus]

The run-time selection of the harmonic scheme for surface interpolation results in

interpolate(const GeometricField<Type, fvPatchField, volMesh>&, const word&) : interpolating GeometricField<Type, fvPatchField, volMesh> using harmonic
surfaceInterpolationScheme<Type>::New(const fvMesh&, Istream&) : discretisation scheme = linear
surfaceInterpolationScheme<Type>::interpolate(const GeometricField<Type, fvPatchField, volMesh>&) : interpolating volScalarField absPerm_K from cells to faces
surfaceInterpolationScheme<Type>::interpolate(const GeometricField<Type, fvPatchField, volMesh>&, const tmp<surfaceScalarField>&) : interpolating volScalarField absPerm_K from cells to faces without explicit correction

i.e. our selection is ignored (as confirmed by the resulting values!) by an automatic switch back to 'linear'?

What's wrong?

Many thanks for any hint