The data set was dumped as an open data set at the request of a database application, such as Information Management System (IMS™), through the application programming interface: System-level enqueues for serialization were not obtained by DFSMSdss when the data set was dumped. During the dump process, the data set was altered in a manner that indicates the dumped version of the data set on the dump tape is unusable and must be discarded.