SMP/E V3R5 has modified the ZONEMERGE command to automatically check for incompatible changes between the originating and destination zones before allowing the merge. This requires that a zone definition entry be present in the destination zone. If a zone entry is not present in the destination zone, or if it is present, but incompatible changes exist between the originating zone and the destination zone, an error message is issued. Additionally, during CONTENT processing, the SREL subentry of the zone definition entry is merged.