[xsl] Muenchain method

Hi all,
 
Could someone help me, it drives me completly mad.
 
For a bibliographic list, I'm trying to display author/title index entries.
I'm using the Muenchain method to group books by author/titles.
There's an index for author and titles. Titles are generated from the
indexsort XML node.
 
Could you try to generate this list with the attached files and see the
result :
 
The problem :
 
Affentranger, Urban 1944- (DE-588)1072229609
        Die Renovation der Klosterkirche Disentis im 19. und 20. Jahrhundert
/ Urban Affentranger | 6
        Turnen und Sport an der katholischen Kantonsschule Disentis
1833-1842 / Urban Affentranger | 5
        Turnen und Sport an der katholischen Kantonsschule Disentis
1833-1842 / Urban Affentranger | 7
Blum, Roger 1945- (DE-588)131690035
        Alfred Oberer - Steuermann im Hintergrund / Roger Blum | 3
        Die Mechanik der Politik in Baselland / Roger Blum | 2
Czouz-Tornare, Alain-Jacques 1957- (DE-588)158860152
Pavillon, Olivier
        Introduction / Olivier Pavillon | 1
  --> Introduction / Alain-Jacques Czouz-Tornare | 4 --> should be under
Czouz-Tornare
 
Your help would be so much appreciated
 
Regards
JP
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BHS_test.zip
Description: Zip compressed data