How can I undo an Integration in Perforce, and still be able to redo it?

As you have seen, rolling back the changelist won't "undo" the integration. The integration records are stored once and for all after an integration happens in the perfroce database.

One possibility (though it isn't recommended) is to "p4 obliterate" the head revisions of the integrated files (target files that is). It's essential that the files weren't modified yet in a subsequent change.

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