All reports of unsupported-source-format for the archive. The extended description of this tag is:
This package uses a different source package format than "1.0", "3.0 (quilt)" or "3.0 (native)". Other package formats are supported by dpkg-source, but they are not allowed in the Debian archive.
Severity: serious, Certainty: certain
Check: fields/format, Type: source
This tag has not been emitted in any package tested by Lintian.