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                                     PP.DIFF
       2
 main
   grade.shift.diffs
   standard.shift.diffs

 Ì       2
main
[effective.date]
&(J)JDD[jdd]

 Field Name                 Len Dat Typ  J  DPM            Offset/Local/VAL
 effective.date               8 DATE     L                 jdd                                                         
 active                       1 YN       L                 &(J)JDD[jdd]|0                                              
 Ì   €     2
grade.shift.diffs
[effective.date,  grade,grade.shift]
&(J)JDD[jdd]G[jdg,jddS]

 Field Name                 Len Dat Typ  J  DPM            Offset/Local/VAL
 grade                        7 FREE     L  PP.GRADE       jdg                                                     
 grade.shift                  1 PINT     R                 jddS                                                        
 grade.diff                   8 FREE     R                 &(J)JDD[jdd]G[jdg,jddS]                                     
 Ì   €     2
standard.shift.diffs
[effective.date,  std.shift]
&(J)JDD[jdd]S[jddS]

 Field Name                 Len Dat Typ  J  DPM            Offset/Local/VAL
 std.shift                    1 PINT     R                 jddS                                                        
 std.diff                     8 FREE     R                 &(J)JDD[jdd]S[jddS]