Description: Indicates the last time an XAIT was received from the network that was not the same version as already in-use. If the host device has not received an XAIT, then this returns a date and time of all zeros. - This must be updated ONLY when an XAIT is received from the network (e.g., not when loaded from persistent storage). - This must NOT be updated if an XAIT is received that has a version the same as the currently in-use version, UNLESS the in-use XAIT was loaded from persistent storage AND it is the FIRST time receiving an XAIT from the network without error. - This must NOT be updated if XAIT is received with a status of error(2). - This must be updated each time an XAIT is received for resulting in a status of okayButRejected(3). - This must be updated if an XAIT is received from the network resulting in a status of okay(1) AND its version is different than the currently in-use version.