Using OUTPUT JCL COPIES by nullifying DD copies

If both a DD statement and a referenced OUTPUT JCL statement contain COPIES parameters, the DD COPIES parameter normally overrides the OUTPUT JCL COPIES parameter. For example, four copies are printed of sysout data set DDA:

   //OTA  OUTPUT  COPIES=3
   //DDA  DD      SYSOUT=A,OUTPUT=*.OTA,COPIES=4

However, if the DD COPIES is a null parameter, the OUTPUT JCL COPIES parameter is used. For example, three copies are printed of sysout data set DDB:

   //OTB  OUTPUT  COPIES=3
   //DDB  DD      SYSOUT=A,OUTPUT=*.OTB,COPIES=

The following example shows a null COPIES parameter on an in-stream DD statement that overrides a procedure DD statement. The null COPIES parameter on DD statement PS.DDA nullifies the COPIES parameter on the procedure DD statement DDA, thereby allowing the COPIES parameter on OUTPUT JCL statement OT to be used. The system prints three copies of the DDA sysout data set.

   //JEX     JOB    ACCT34,'PAUL BENNETT'
   //INSTR   PROC
   //PS      EXEC   PGM=ABC
   //OT      OUTPUT COPIES=3
   //DDA     DD     SYSOUT=A,OUTPUT=*.OT,COPIES=2
   //        PEND
   //STEP1   EXEC   PROC=INSTR
   //PS.DDA  DD     COPIES=
   /*