During the movement of a backup version or backup of a migrated data set, the first record read for the DFSMShsm copy of the data set did not contain a valid common data set descriptor (CDD) or the backup version or backup of a migrated data set has a format-8 DSCB. The DFSMShsm copy of the data set may have been overwritten. The name of the data set being processed appears in the associated ARC1001I or ARC0734I message having a return code of 29. If the backup version has a format-8 DSCB, use V1R12 or higher to process it.