Can Pre-load (HSFG) assemblies be de-assembled once they have been assembled?

Due to safety reasons and according to BS 4604 Part 1

“If after final tightening a bolt or nut is slackened off for any reason, the bolt, nut and washer shall be discarded and not re-used.

In accordance to EN 14399

If the assembly has been tightened to the minimum force – 70%, assembly cannot be re-used.