The external auditor will come with a gun to kill you. :-) If you are lucky then you are at a MM training when he comes.
go SE91 and read the long text to message M7 769 and M7 709 to know what you did.
Don't panic, you have only set a deletion indicator and made the document unchangeable, you might create a bit confusion if you do reports on inventory documents and have now a mix of deleted documents which have already been posted and deleted documents which have been deleted earlier.
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