COF503I DLF START IS REJECTED. “SUB=MSTR” IS REQUIRED ON THE START DLF COMMAND.

Explanation
 The system rejected the request to start the data
lookaside facility (DLF). The START command is missing a parameter.
Specify SUB=MSTR on the START command for DLF to run independently
of the job entry subsystem (JES).

System action
 DLF invocation fails.

Operator response
 Reenter the START command with the required
parameter.

Module
 COFMISDO

Source
 Data lookaside facility (DLF)

Routing Code
 2,10

Descriptor Code
 4