Let's say we refer to documents that we have copies of. It's fine to say something like "this document has 2 copies" - that would mean that there is an original document + 2 copies of it.
But I've seen in some official notifications something like "this document was drawn up in one copy". Is this grammatically correct ? Because a copy implies that there are already 2 documents in existence. So that formulation used for documents emitted as only 1 exemplary does not seem correct.