The classical style guide on track titles instructs us to "list key, catalog number, movement numbers, etc. if they are included as part of the titles on the release, but not otherwise".
However, the format of the movement number is not clearly specified. (The format of the others is covered by some language-specific guidelines like this).

The overall picture from the current guideline is "if there are no serious issues, stay as close to the info on the release as possible". So I would like to have an addition to the guideline telling us to take the format of the movement numbers from the release, too. For example, if movement numbers are given in arabic numerals, don't transform them to roman numerals.

The motivation for this proposal came from this discussion.