Package: debian-policy Version: 4.4.1.1 Severity: normal The full sentence in question is "This field should not be added solely for purposes other than satisfying license or DFSG requirements to provide full source code".
"solely for purposes other than satisfying" is the problematic construction and should be rephrased for readability and clarity. I suggest replacing the whole sentence with "The purpose of this field is exclusively for cases where a package's license, or when DFSG requirements, necessitate its presence; Built-Using should not be used for any other purpose". This is much more clear and it flows nicely into the next sentence "In particular, it should not be added solely to enable finding packages that should be rebuilt against newer versions of their build dependencies." Regards, Nicholas