Specifies support for different levels of security acceptance information in ATTACH requests received from this partner LU. Possible values are: none - No access security information will be accepted on allocation requests (ATTACH) from this LU. conversation - Allocation requests will not be accepted that include already verified or persistent verification indicators. Accept conversation-level access security information, which must include both a user Id and password, and may also include a profile. alreadyVerified - Allocation requests will be accepted that include already verified indicators. Persistent verification indicators will not be accepted. persistentVerification - Allocation requests will be accepted that include persistent verification indicators. Already verified indicators will not be accepted. aVandpV - Allocation requests will be accepted that include already verified or persistent verification indicators.