LBLNUM

Last active label number on the volume. The value of this parameter can be greater than, but cannot be less than the value of ACTIVEDS (the number of active data sets on the volume).

Note: If the value of the LBLNUM field is lower than the value of ACTIVEDS, the value will be automatically copied from the ACTIVEDS field. If the value of the ACTIVEDS field is zero, the LBLNUM value will be automatically set to zero.