TeiiD Designer multisource column alias not usable in transformation

Issue

• I have a physical model that is flagged as "multi-source" in the VDB with a pseudo column defined "SRC" to distinguish at runtime. While in the Designer I cannot write a transformation that references such pseudo column without an error that the column does not exist. My understanding is that I do not model that column (as when I query at runtime it DOES appear though not modeled).