ZONEDATA(MIG) is meant to provide compatibility with the NUMPROC(MIG) option in 
pre-V5 versions. COBOL 4.2 with NUMPROC(MIG) abends with a S0C7 with the 
following instructions:-

001154  IF                                                                      
                                 
   0004CC  4DE0 9152               BAS   14,338(0,9)             TGT TEST 
INFORMATION AREA +10                   
   0004D0                 GN=19    EQU   *                                      
                                 
   0004D0  F211 D110 8010          PACK  272(2,13),16(2,8)       TS2=0          
                   AS-NUMS       
   0004D6  F911 D110 A0B2          CP    272(2,13),178(2,10)     TS2=0          
                   PGMLIT AT +162

This APAR explains that in versions 5 to just before the recent 6.2 fix it was 
"incorrectly" fixing the S0C7:-

https://www.ibm.com/support/pages/apar/PH28379

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