An EU plant passport is a small label carrying four pieces of information: the botanical name of the plant, the registered operator and member-state code of whoever issued it, a traceability code that ties the plant to a specific batch, and the country of origin — the field usually printed as D.
Three of those four are facts you already hold. You know what the plant is, who you are, and which batch it belongs to. The fourth is different in kind: it asks a question about the plant's own history, and that history may have happened long before the plant ever reached you.
For a plant you raised yourself from seed on your own site, the answer is easy. For most finished plants moving through a modern supply chain, it is not — because the plant has already lived in more than one place.