Thread:Wayne999/@comment-3542404-20160114142723/@comment-3542404-20160819215036

It's not difficult...

It means that the stories written here cannot interfere with the facts and events established by official media. To quote the rulebook:

"4. No direct contradictions of definitively established canon. For example: Setsuna was really a girl in disguise, or that Celestial Beings's was a huge fraud to make money for weapons manufacturers."

- Gundam Fanon:Rules

Your work was tagged as being Not Canon Friendly because you were using a pre-existing timeline (Anno Domini) and none of your work fit into it properly.