This is possible in several ways - although not a single solution is particularly neat.
use the html external link for other_project source code, where other-proj is the identifier for another project.
"other project source":http://myserver:3000/projects/other-proj/repository/entry/file.txt
determine the source path through the parent directories, so from the source directory of your current project, go to 3 directory levels before moving back to the repository of another project. Note that the source link must be inside double quotes to work. This method at least stores the original tag at the beginning of the link.
source:"../../../other-proj/repository/entry/file.txt"
Adrian
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