Ottava only for Voice

[zs.hassia]

The example with the problem is

[Example]

\version "2.19.41"

global = {
  \key c \major
  \time 4/4
}

upper = \relative c' {\voiceOne
  \global
 e'1 \ottava #1 e'1
  
}

lower = \relative c' { \voiceTwo
  \global
 e,1 ~  e1
  
}

\score {
  \new Staff  { \clef "treble_8" << \upper \\ \lower >> }
  \layout { }
 
}

[\example]

I do not know, how to switch off the influence of \ottava #1 in the  upper
voice to the lower voice.

Regards