Forcing hshift not working...

[Alberto Simões]

Dear Lilypond users,

I am trying to use
  \once \override NoteColumn #'force-hshift = #-1.0 ees2.
to force a note to shift to the left, removing a collision in different
voices, but this command is not changing a thing :(
Tried to use \shiftOn and \shiftOnn but it did not work as well.

You can check Lilypond render at
http://musica-liturgica.net/viewfull.pl/86
Check bar number 7, piano upper voice.

You can also download the .ly file from
http://musica-liturgica.net/ly.pl/86.ly

Thanks for any hint.
All the best,
Alberto
-- 
Alberto Simões