All right! Understood and annotated!
I use 534 if catalog a digital versión (scanned) of a book… for example
- - - - - - - - - - - - -
...las bibliotecas han liberado a más personas que todas las guerras del mundo.
Erika Charles Niño.
Procesos Técnicos. Procesamiento Documental.
(52) + (01 81) 83 29 40 15 ext. 5392
You're correct about the 240 field, but you'll want to use a 546 note for information about the original edition, etc.
If you look at the field and description note for the 534 field, you'll see it doesn't match your example:
Descriptive data for an original item when the main portion of the bibliographic record describes a reproduction of that item and the data differ. Details relevant to the original are given in field 534.
The resource being cataloged may either be a reproduction (e.g., scanned image, or PDF), or an edition that is similar enough that it could serve as a surrogate for the original (e.g., HTML).