Secure request with attachement

Hi, 

when i send my request with attachement and with secure certificat (jks), i get always an error(security not allowed).

but when i use same request without attachement and with a same secure certificat then word be sent  

my attachement is like this : 

.....

<mes:document>
<dom:test xsi:type="file:XopFile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<file:name>test.odt</file:name>
<file:type>application/vnd.oasis.opendocument.text</file:type>
<file:binary>cid:14567893</file:binary>
</dom:test>
</mes:document>
........

Thinks for your help in advance

Kind regards