Why can't a Normal change (SMMJ) use the continual cycle, and which cycles must it use?

A normal change must be packaged + sequenced + rigorously tested (sharply reducing production-buffer risk) — which the flexible, one-by-one continual cycle doesn't provide.

So it's not allowed in the continual cycle — it must go in a phase or release cycle. Used for new functionality/features/SAP Note corrections/minor defects.