Overview:
During a Vault Loader Import an error occurs: Version [#.#] Already Defined for Document with ID [####].
Root Cause:
When versions of a document are first created, a version number is associated with each of them. Even if that specific version is later deleted, that version number remains reserved for the version that once existed. This can sometimes present itself as a document that appears to be skipping ahead in version numbering when a new version is created (because that version used to exist, and its number is reserved). If users input a reserved version number in the Vault Loader Import sheet they receive the error during an import.
Solution:
For a solution, if the version number is important, it is recommended to start over and create a new document.
Related Documentation:
Vault Loader Documentation: Vault Loader: Add Document Versions