perforce integration error

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http://stackoverflow.com – I am working on c++ files managed by perforce. When I did integration, I made some mistakes so that others' changes also become my change. Now, I need to reverse this by doing integration. But, perforce cannot find the differences of ny changes and others changes. But, I do not want to do it manually , I would like to ask perforce to do it in p4v (a perforce GUI). Any help will be appreciated. (HowTos)