London, Aug 30 - Union bosses at the Screen Actors Guild (SAG) have warned members not to take part in the documentary about late pop legend Michael Jackson's doomed 'This Is It' tour.

Sony Pictures have purchased rehearsal and behind-the-scenes footage from concert promoters AEG Live, filmed at Los Angeles' Staples Center, as Jackson prepared for his residency at London's O2 Arena.

The studio planned a two-week run for the film beginning Oct 28. However, SAG bosses have announced that the film's producers have not agreed to the minimum basic terms and conditions for performers and background actors employed on the project, reports contactmusic.com.