Should be... (speaking from experience) but not to my knowledge.
You may want to look at the very temperamental address tables 'ADRP'. I'm not sure but the system assigns a sequential key (person number, if I remember correctly) for every person specific field in SU01 (there is seperate table for each field: name, address, phone..); I think that the system may be assigning a new 'person number' every time a field is altered... Which could give you some past history.
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