Hello,
When you use the named expression to assign a device level tag using the term named for tank, heat exchanger or other type, that's fine.
Example: Tank-T200 000 or Pump-P200 100
But when you use generic material, it's not good, because all the generic material is placed at the same level (without tag).
Level: Equipment
How to assign a level to a generic device tag using a named expression
Example: Equipment-S-200 450
Best Regards
Salim