DINRELNO specifies the relative request number of the allocation you are requesting information about. It is mutually exclusive with the ddname (DINDDNAM), dsname (DINDSNAM), and pathname (DINPATH) keys. When you code DINRELNO, # must be one, LEN must be two, and PARM contains the relative number.
KEY # LEN PARM
000F 0001 0002 000A