"That service is already in this map"

When you add a service, the new name is checked against the services already on the map, ignoring capitalization. If it matches, the addition is refused and the message reads, with the name filled in: "[Service name]" is already a service in this map. Use Revise to change it, not Extend.

Why it refuses

The check prevents duplicate mappings. Two services with the same name in one map would produce overlapping workflows for what is structurally a single service, and the map would stop being a reliable blueprint.

What to do instead

To change how an existing service is mapped, use Revise. That is the tool for reshaping what is already in the system.

To map a genuinely new service, give it its real, distinct name. If the name is honestly different from what is on the map, the addition proceeds normally.