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A fix is available


You can track all active APARs for this component.


APAR status

  • Closed as program error.

Error description

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
    *                 Release 1 Modification 0.                    *
    * PROBLEM DESCRIPTION: Enable backward migration to version    *
    *                      7.1.0 after a queue manager has been    *
    *                      started with the version 9.0.0 code.    *
    * RECOMMENDATION:                                              *
    PTFs for the backward migration APAR must be applied on version
    7 queue managers prior to attempting fallback from IBM MQ for
    z/OS version 9.0.0.
    Attempting to restart a queue manager, which has been run with
    version 9.0.0 libraries, at version 7 without this PTF will
    result in abnormal termination of the queue manager with
    ABEND5C6 reason code 00C90D01.
    The MQ for z/OS ISPF administration panels, CSQOREXX, are not
    updated by this APAR. The version 9.0.0 CSQOREXX application is
    able to connect to and administer version 7.1.0 queue managers
    and you are advised to use either version 9.0.0 panels, or those
    at the same level as your queue manager during the period of
    When reverting to Version 7.1.0 after running a queue manager at
    version 9.0.0 backward migration needs to tolerate the new
    capabilities introduced in both Version 8.0.0 and Version 9.0.0
    and the following should be considered:
    - New object attributes introduced in Version 8.0.0 will not be
      present in Version 7.1.0, and when you subsequently migrate to
      Version 9.0.0 they will be reset to default values.
      Note, there are no new attributes introduced in Version 9.0.0.
    - If you are using the MQ Explorer to administer your queue
      manager then after migration between releases the following
      Explorer actions must be performed:
      1: Remove the migrated z/OS queue manager
      2: Add Remote Queue Manager
    - AUTHINFO objects with AUTHTYPE(IDPWOS) will be deleted on
      backward migration. Any QSGDISP(GROUP) AUTHINFO objects with
      AUTHTYPE(IDPWOS) will be invisible to a Version 7.1.0 queue
      manager in a mixed Version 9.0.0 and Version 7.1.0 queue
      sharing group.
    - TOPIC objects with CLROUTE(TOPICHOST) attribute set will be
      deleted on backward migration. Any QSGDISP(GROUP) TOPIC
      objects having CLROUTE(TOPICHOST) attribute set are hidden
      from a Version 7.1.0 queue manager in a mixed Version 9.0.0
      and Version 7.1.0 queue sharing group.
    - Proxy subscriptions created on behalf of remote subscribers
      for TOPICs defined with CLROUTE(TOPICHOST) attribute will be
      deleted when the TOPIC object is removed on backwards
    - When there are subscribers on the queue manager being backward
      migrated, for TOPICs defined with CLROUTE(TOPICHOST) on
      different queue managers, the proxy subs for these subscribers
      will be left on the queue managers hosting the topic. The
      local subscriber will continue to receive publications. If the
      queue manager hosting the TOPIC is also backwards migrated,
      then the proxy subs will be deleted. These subscriptions can
      be identified by issuing DISPLAY SUB(SYSTEM.PROXY_2*)
      SUBTYPE(PROXY) on the remote host queue managers and looking
      for subscriptions with a DESTQMGR matching the local queue
      manager which is being backwards migrated. They can then be
      deleted as for any administrative subscription using the
      DELETE SUB command.

Problem conclusion

  • 100Y

Temporary fix


APAR Information

  • APAR number


  • Reported component name

    WMQ Z/OS V7

  • Reported component ID


  • Reported release


  • Status


  • PE




  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date


  • Closed date


  • Last modified date


  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    PI64466 UI39996



Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID


Applicable component levels

  • R100 PSY UI39996

       UP16/08/25 P F608

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

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Document Information

Modified date:
02 September 2016