The tag is present in Lintian version 2.104.234. That is the most recent version we know about.
You've specified more than one target distribution for your upload
*.changes file, probably via the most recent entry in the
Although this syntax is valid, it is not accepted by the Debian archive management software. This may not be a problem if this upload is targeted at an archive other than Debian's.
Refer to Debian Policy Manual section 5.6.14 for details.