DUNMEMBR specifies that a particular member of the data set is to be deallocated. The member name can contain system symbols. See the information on using system symbols in z/OS MVS Initialization and Tuning Reference.
The dsname unallocation key (DUNDSNAM) is required with this key. When you code DUNMEMBR, # must be one, LEN is the length of the member name, up to a maximum of 8, and PARM contains the member name.
KEY # LEN PARM
0003 0001 0004 D4 C5 D4 F1