> In general [..]
...but apparently not always. Not something I'd want to bet my business or reputation on.
"AUSTRIA’s Federal Administrative Court [..] declared a framework contract from Austrian Federal Railways (ÖBB) to Stadler for the delivery of up to 186 double-deck trains to be null and void due to an alleged formal error in the qualified electronic signature of the offer." (September 2021)
https://www.railjournal.com/news/austrian-court-annuls-stadl...