2524 (09DC) (RC2524): MQRC_SELECTOR_NOT_ALTERABLE
Explanation
An MQSUB call was issued with the MQSO_ALTER option and the MQSD contained a SelectionString. It is not valid to alter the SelectionString of a subscription.
Completion code
MQCC_FAILED
Programmer response
Ensure that the SelectionString field of the MQSD does not contain a valid VSPtr and that the VSLength is set to zero when making a call to MQSUB.