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                                     MRI.SUB.REQ.FLD
     i   2
   mri.subscriber.required.fields
     mri.sub.req.fields

 Ì     i   2
mri.subscriber.required.fields    (main) 
[prefix]
?ESBR[epx]

 Field Name                 Len Dat Typ  J  DPM            Offset/Local/VAL                                        
 prefix                       2 FREE     L                 epx                                                         

 Ì   €�   i   2
mri.sub.req.fields    (req.fields) 
[prefix, req.field.num]
?ESBR[epx]RF[esbrN]

 Field Name                 Len Dat Typ  J  DPM            Offset/Local/VAL                                        
 req.field.num                2 PINT     R                 esbrN                                                       
 req.field                   25 FREE     L                 ?ESBR[epx]RF[esbrN]|0                                       

 Ì       2
 INDEX FILE/INTERNAL NAME           SUBSCRIPTS/PHYSICAL BASE

 mri.sub.req.fields.index           [prefix,req.field]
   req.fields.x                       ?ESBRX[epx,esbrF]