What do you have to keep repeating to the users? The manual is the same concept as providing a hyperlink: instead of speaking/typing everything over and over, you just link or manually point them to the manual.
How much work do you want to do? If your standards are automated from one set of data and documented in another, then every time something is changed that change must be duplicated into the manual. That requires time and introduces the possibility of error ("But it says right in the standards SOMLAYER, not SOMELAYER!!!"). We used to do that and its a royal PITA to work with. Better to have "self documenting standards"; that is, the data that is used by the standards automation should be human-readable in some way.