Project archive cannot be converted

Problem

When migrating ETS5 archived projects there is a message similar to this one:

"This archive could not be migrated into the ETS6 archive because it shares the same history as another project that already is inside the ETS6 archive."

Cause

Every project in ETS5 has a project ID, however those are not unique across all projects from the same ProjectStore folder of the same ETS5 installation. In ETS6 all projects have a unique project ID and therefore ETS prevents importing projects sharing the same project ID. Thus, a second project with the same project ID is rejected.

Solution

Since the ETS5 archived project import cannot automatically resolve these conflicts, there is a need for manual conflict resolution. To do so, follow those steps:

1. Ensure that the Collaboration mode is activated.
2. Manually import the non-migrated ETS project archive into the local project store.
3. ETS6 detects a conflict with the project already in the archive. 
4. Click the 'Backup Copy' button to manually backup the project into the project archive. This will backup the project into the project archive and will create a new unique project ID.