Where in the regulations does it require cardholder's cards to be cancelled when a unit changes AOs?
The cards must be cancelled only when the cardholder is assigned to a different account with a different accounting citation. Simply changing the Approving Official in the same activity/account does not require that the existing cards be cancelled. If your unit is closing and you will be purchasing on behalf of another unit, the old card must be cancelled because it contains obsolete accounting information.
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