As per parent task's description (T847), there exists homonyms dumps coming from different sources.
The original urls was not amongst the data transmitted from googlecode when we retrieved information.
Thus we had to build them back. The original origin_url computation was too naive.
This results in clash in origin urls fields.
For the same dumps, we have the same origin (googlecode hosted googlecode and eclispselabs dumps in different arborescence tree).
This needs to be fixed.
This would also explain an error so far unexplained 'No revision found' on the latest svn loader rescheduling.