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Hi Kawish,
all important system tables are secured, nobody including DBC has rights to INSERT/UPDATE/DELETE/DROP them. This is done to protect the system from getting damaged.
There's no built-in process to reset an identity (of course you might do an enhancement request), thus when you do an illegal update the internal process to assign the sequence doesn't know about it and will keep it's old range until it needs a new one (i just tried it).