When a client starts to edit a member of a partitioned dataset, z/Server locks that member against simultaneous edit from a 3270 TSO user by serializing against the resource SPFEDIT/data_set_name(member_name). That ENQ is held by the command task of the scheduler address space the user server belongs to.
If for some reason the client does not finish the edit process, the member stays locked. In the past another client used the Dequeue function from the context menu for the dataset member to release someone else's serialization. To reduce the integrity exposure of this (client) function, the following command can be used:
F <scheduler|userserver>,SPFDEQ,DSN=<datasetname>,MEM=<member>
It will release the ENQ that protects against parallel updates of the same dataset / member by different users. The CMDTASK DD statement will contain the following messages acknowledging deletion of the resource:
F <scheduler>,SPFDEQ,DSN=DATASET.NAME,MEM=MEMBER SLR0044I 08:46:21.693 Dequeue for Major-Name SPFEDIT and Minor-Name DATASET.NAME MEMBER SLR0046I 08:46:21.694 Dequeue successful