Description of problem:

My spacewalk server is using multi-organizations. 
The spacewalk default organization creates, owns and shares to other orgs main channels.  
When a custom organization creates its own child channel, under a SHARED parent channel, all is working fine. 
But when trying to clone this specific channel, the WEB-UI throws an error "Internal Server Error".
Looking for the bug report sent by email, I get : 
Error message:
  illegal parent id at /usr/share/perl5/vendor_perl/Sniglets/ChannelEditor.pm line 96.

Using the API (channel.software.clone) to do this produces the same kind of result : it throws an error for the parent channel given in parameter -> 

redstone.xmlrpc.XmlRpcFault: No such channel: cha-rhel-5-i686

Version-Release number of selected component (if applicable):
Spacewalk 1.7

How reproducible:
Always

Steps to Reproduce:
1. Create and share parent / child channels from Spacewalk Default organization to other orgs
2. From a custom org, create a specific child channel under a shared parent channel
3. Try to clone this specific child channel
  
Actual results:
On web UI -> internal server error
With API call -> no such channel (concerning the parent one)

Expected results:
Clone is done successfully, cloned child channel is linked to the shared parent channel

Additional info: