Because resource recovery processing might involve many applications, resource managers, and syncpoint managers, your installation's operators and programmers might have to resolve error conditions resulting from application, system, or network failures. APPC/MVS attempts to resolve error conditions whenever possible, but manual intervention is sometimes required for the following situations. APPC/MVS notifies your installation of these situations by issuing ATB2xx messages, which are described in z/OS MVS System Messages, Vol 3 (ASB-BPX).