invoice report offers created date (and created time stamp) information and based on this you can analyze process time frames e.g. archived date vs created date or created date vs due date (e.g. how many invoices have been created before or after due date).
However you miss the information whether this created date is really the original creation date of the document or the date when created by invalidate and edit (which influences your analysis). Since in case invalidate + edit was performed you have just the date when it was created using this function but lack the information (a) that this was done and (b) what was the real original creation date.
It would be useful to have both information (if possible to retrieve), at least to have the indicator that this document has been created through this function.