The tag is present in Lintian version 2.104.244. That is the most recent version we know about.
The given package declares a dependency on itself in its
debian/control stanza. Current versions of dpkg-gencontrol will
silently fix this problem by removing the dependency, but it may indicate
a more subtle bug (misspelling or cutting and pasting the wrong package
Refer to Debian Policy Manual section 7.2 for details.