When you use VOL=SER for data set stacking, that is, to place several data sets on the same tape volume or set of tape volumes, at least one of the volume serial numbers specified must match one of the volume serial numbers for the data set on which this data set is being stacked. Use VOL=SER when stacking multivolume, multi-data sets within the same job step.

Related Reading: For more information on data set stacking, and on when to use VOL=SER versus VOL=REF, see Data Set Stacking.