Michael Jackson's estate is lashing out at the people behind a new MJ documentary set to debut in Japan tomorrow -- claiming fans are being duped into believing the flick was authorized by Team MJ.



The estate has released a scathing statement claiming that Flamingo Features is promoting the movie in a way that is misleading MJ's fans into believing the film -- shot by former MJ confidante Marc Schaffel -- was properly authorized.

The estate also makes it clear it doesn't endorse the flick and none of the profits will benefit MJ's children. They also note that the movie is not allowed to contain any of Michael's music.

Schaffel doesn't appear to be bothered -- the above photo was taken moments ago at the movie premiere in Tokyo ... where Schaffel took the stage and told fans Katherine Jackson sent along her best wishes.

Tuesday, we shot video of Schaffel and Debbie Rowe boarding a plane to Tokyo.