I have the same error like those two guys that asked similar question in community (1, 2) but I definitely have different use-case. I am trying to copy a standard ABAP CDS DEMO_CDS_CURR_CONV into custom Z one and it is failing

I tried the solutions from those two questions but they are not relevant to me, I'm on Trial system and I have the DEV permissions, I can create this CDS from scratch with the same data but not copy it from the standard one.
Why?