[sending to bts instead of dev-mlist because the big attachment can
be removed later on once the issue has been resolved]

hi, 

I'm having problem using GRML_LIVE_SOURCES to specify a third party repo,
namely debian-multimedia. Many attempts have been failed, and the last one's
cause is beyond me. Is it because:

 W: Duplicate sources.list entry...

Moreover, which file in chroot does GRML_LIVE_SOURCES affects? I've checked 

 grml_chroot/etc/apt/sources.list
 grml_chroot/etc/apt/sources.list.grml
 grml_chroot/etc/apt/sources.list.d/debian.list
 grml_chroot/etc/apt/sources.list.d/grml.list

but none seems to contain my setting. 

Please help. 
Thanks