HP 3000 Manuals

Arithmetic of Group Level Items [ COBOL/HP-UX Compatibility Guide for the Series 700 and 800 ] MPE/iX 5.0 Documentation

COBOL/HP-UX Compatibility Guide for the Series 700 and 800

Arithmetic of Group Level Items 

DG Interactive COBOL allows arithmetic of group level items, but this is
not supported by this COBOL system.  We recommend that you redefine such
fields into numeric items to overcome this problem.

MPE/iX 5.0 Documentation