When a tape volume is opened for input or output using NL or BLP processing, the CA 1® Tape Management message IECTMS1 requests the operator to supply the volume serial number. The data set can be cataloged to the operating system or accessed from the TMC. For a specific input or output volume request, the volume serial number must be the same as specified in the JCL or cataloged to the operating system. If not, CA 1® Tape Management assumes the wrong tape volume is mounted and has the tape demounted. For a nonspecific output request, enter the same volume serial number twice consecutively to ensure that you do not hit a wrong key.
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