When demolishing pipes (for example) at a later stage, the type of system and classification are shown as "Undefined" for all phases, even those before demolition.
Example: I create a pipeline with «Fecal» system in Existing Phase. At the moment in which I put that the demolition Phase is New Construction, that pipeline has an undefined system, in all phases.
I understand that it would be very useful to be able to keep the system in the pre-demolition phase for both viewing and filtering in the Existing phase.