Slur and tie between chords

[Janne Uusitalo]

Hi,

I've attached two images to illustrate a problem I'm having with
simultaneous notes, slurs and ties.

The original version is what I'm hoping to get, and the lilypond
version is what 2.14.2 offers me for

%{ 24 %}    <des des'>2(~
%{ 25 %}    <des as'>)~

Any ideas on how do I make the slur connect the two higher notes
instead of the two lower ones?

Thanks in advance.

Janne

tie-slur-lilypond.png
Description: PNG image

tie-slur-original.jpg
Description: JPEG image