By default, ACF2 deletes the access rule whose high-level qualifier matches the logonid when the logonid is deleted. The RULE parameter of the delete command deletes the access rules for the corresponding logonid in the Rule database. The NORULE parameter prevents the access rule from being deleted.
Specify NORULE in the DELETE command of the logonid to prevent the access rule from being deleted.
For example (from ACF mode):
DELETE USER001 NORULE