Some universities have ethics codes that require (whatever that might mean) members to report misconduct within the community.
Are there universities where such a requirement extends to reporting misconduct within the "larger academic community"? For example, if someone at school X learned that someone at school Y had falsified laboratory data, the X person would be required to report the person at Y.
The example of falsified data is imperfect as it may be covered under legal and contractual rubrics not local to a university, such as a government grant agency requiring recipients to report any known misuse of government funds. A better example is plagiarism in student papers, that usually does not violate any legal codes (unless additional scholarship money is earned through the plagiarism), and is treated as a reportable crime only within universities' internal ethics codes. The question is whether any of those codes purport to protect the integrity of other institutions.
I'm asking only about reporting of academic or institutional misconduct, especially the kind where the only effective means of reporting is to the other university.
I have to believe that at least one school's ethics policy says to report without specifying that misbehavior should only be challenged on their own campus. Indeed, professional ethics suggest you should do so no matter where it arises.
But it seems you are looking for specific examples. In that case, I really believe you are going to have to do some research to get a solid answer. Should be easy to send out a bunch of letters to various schools saying your investigating differences between written ethics statements and you'd appreciate it if they could send you a copy of theirs. Heck, these days many are probably available via the schools'websites...