Videos doesn't Approved for Monetization...

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Hey guys...Youtube has recently enable me to Monetize my videos..i have around 31 videos but when i submit few of them for revenue sharing they didn't get approved..... I make videos with help of Windows movie maker and sony vegas pro....so it means that i edit videos,mix them add some music and upload them to youtube....but when i submit them for revenue sharing i get reply that your video has been disable from revenue sharing because you didn't provide enough documentation....i need to know what kind of documentation i need to provide them...can any one help me....also if you have face same difficulty how did you get through it...