Clause 7.3 deals with statements of sustainability. The subject is the broadest kind of claim, the one that says a product or organisation is sustainable. Such a claim is hard to support because sustainability spans environmental, social and economic questions, while this document is about environmental statements. A programme that allows the wording needs a record of what the claim covers and what it does not.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.