The normal serialization was not obtained for the data set, but the Backup-While-Open (BWO) status was either 100 or changed to 100 from 110. As a result, the data set was processed even though it was already opened by another application. See Appendix B, "Data Integrity—Serialization", in z/OS DFSMSdfp Storage Administration for more details about the BWO status indicators.
Processing continues. If this message was unexpected, the Backup-While-Open (BWO) status have been incorrectly set or left set by an application.
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