Lauchpad doesn't let me to track two remote bugs from one project

[Anderson]

This is the case:

#1. I just reopened a closed bug in package "Amarok" from project "Ubuntu".
https://bugs.launchpad.net/ubuntu/+source/amarok/+bug/380147

#2. In upstream's bug system (http://bugs.kde.org), there are 2 bug reports about the same problem, but the first is not marked as a duplicate of the second.
http://bugs.kde.org/show_bug.cgi?id=212910
http://bugs.kde.org/show_bug.cgi?id=214559

#3. I tried to add watchers for these bugs in the project "Amarok" , but Launchpad allows only one bug watch in a project.

#4. As a workaround, I marked the bug affects another project (but I believe that bug is already fixed there).

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Launchpad should allow adding multiple bug watcher in one project, if upstream bugs aren't marked as duplicate.