A toleration PTF will enable OS/390® V2R7 SMP/E, z/OS® V1R2 SMP/E, and SMP/E V3R1 to automatically check for incompatible changes made by a higher level of SMP/E. A toleration PTF will also provide a warning message should a user try to issue an UPGRADE command on a release of SMP/E prior to V3R2.