DFS3907A REPLY "S" TO SKIP, OR "U" TO RETRY AFTER CURRENT DUMP COMPLETES.

Explanation
 An SDUMP for another task not belonging to this IMS system
was being taken at the time the SDUMP was issued.

System action
 The operating system did not satisfy the IMS SDUMP
request because it can create only one SDUMP at a time.
IMS
action: IMS waits for the operator to respond.

Operator response
  If you receive one of the following messages,
reply U to retry the SDUMP request:   IEA911E COMPLETE DUMP ON
    SYS1.DUMPxx....
         or
IEA911E PARTIAL DUMP ON
    SYS1.DUMPxx.....
If you are not sure if the
current memory dump has completed, reply U. IMS reissues
message DFS3907A if the current memory dump has not
completed.
If you want to skip taking a memory
dump, reply S. However, be aware that IMS does
not try to create any more SDUMPs for the current error. IMS tries
to produce alternative diagnostic information (such as online memory
dumps, spin-off memory dumps, software LOGREG entries, and dependent
region memory dumps).