/usr/share/doc/libglobus-gridmap-eppn-callout-dbg/changelog.Debian.gz is in libglobus-gridmap-eppn-callout-dbg 1.9-2.
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It is a symlink to /usr/share/doc/libglobus-gridmap-eppn-callout-dbg/../libglobus-gridmap-eppn-callout/changelog.Debian.gz