removing sharp sign

[Helge Kruse]

Hello,
I am transcribing a score. I want to keep it as similar to the original 
as possible.

In the following excerpt the C-sharp is continued with a tie on the next 
line. The measure #3 at the new line starts with C-sharp. When you have 
the tie from measure #3 to #4 the sharp is omitted. But surprisingly the 
C-sharp in the appoggiatura has the sharp sign.

1. How can I remove the # inside this grace note?

\version "2.14.2"

violineTwo = \relative c' {
  \repeat unfold 16 c16
  a'8.( b16) b8.\mordent( a32 b) cis8-. cis, cis4~ | % 40
  cis8 b16 a b8-. b-. \appoggiatura{cis16} b8 a  r8 cis~ | % 41
  cis \repeat unfold 14 e16
}

\score {
  \new StaffGroup <<
    \new Staff { \violineTwo }
  >>
}

Regards,
Helge