The tag is present in Lintian version 2.109.24. That is the most recent version we know about.
The package declares a build dependency on a version of a package with a -1 Debian revision such as "libfoo (>= 1.2-1)". Such a dependency will not be satisfied by a backport of libfoo 1.2-1 and therefore makes backporting unnecessarily difficult. Normally, the -1 version is unneeded and a dependency such as "libfoo (>= 1.2)" would be sufficient. If there was an earlier -0.X version of libfoo that would not satisfy the dependency, use "libfoo (>= 1.2-1~)" instead.