LibreOffice and Samba shares

Hello,
We are french, so excuse us for my approximate english.

Our installation is :
1 PC server (Xubuntu 12.04) LibreOffice 4.1.1.2
6 PC clients (Ubuntu 12.04) LibreOffice 4.1.1.2

PC server shares, via samba, in read/write permissions the files to the
entire network. No problem with image and pdf  files (for example).

Our problem is this one :
We cannot access by LibreOffice to network files. When we double-clic or
when we try to open them with LibreOffice. 
It works when we copy on the PC Client the file and open it in local with
LibreOffice.

The error message in french :
/Le fichier 'adosjeunes.odb' est corrompu et ne peut donc être ouvert.
LibreOffice peut essayer de réparer le fichier.
La corruption peut être le résultat de la manipulation du document ou d'une
détérioration de la structure du document due à la transmission des données.
Nous vous recommandons de ne pas faire confiance au contenu du document
réparé.
L'exécution des macros est désactivée pour ce document./
in english :
/The file 'adosjeunes.odb' is corrumpted and cannot be openned. LibreOffice
can try to repair the file.
The corruption may be the result of document manipulations or deterioration
of his own structure due to data transmission.
We recommand you to don't trust the content of the repaired document./

And this message :
/
LibreOffice may repair this file ?/
And :
/Input error output/

Did you have some clues to resolve this problem ?

Many thanks.



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