ContributionsMost RecentMost LikesSolutionsRe: STP error CMN.ATO.GEN.20001 Hi, Im also having the same above issue. Ive only just noticed but have recieved 3 errors over the last few months. The strange thing is that not all have been rejected. Some are fine others are not. We have naver changed our ABN so have no clue why this isnt correcting itself.