For buyers contracting authority
A large platform programme often runs three things at once, the licence, the build and the rollout, sometimes under a single notice. 72263000 is the rollout: standing existing software up through configuration, data migration, integration, and go-live, with acceptance tied to a working deployment rather than new source code.
The boundary that trips authorities is development (72262000). If the supplier writes the application, that is development, even when rollout is part of the job. Reserve implementation for deploying and configuring software whose core already exists.
The other neighbour is supply (72268000), buying the licences and the product itself. When a single programme bundles licence, build and rollout, set the primary CPV code by the dominant spend rather than the activity that comes first.