E.18.2:1.2 - What goes wrong if missed

A project source expression, source publication, or diagram can make a graph-shaped expression look like the flow structure itself. Then mathematical neatness silently becomes evidence, work completion, gate readiness, architecture adequacy, or permission to act. The opposite error is also common: every graph-shaped structure is demoted to “just a diagram”, so the selected structure, its slices, and its refresh boundaries disappear.