HP 3000 Manuals

HP RPG/XL Utilities-Part 3 SIGEDITOR

Appendix C  Calculating the Self-Check Digit 

Introduction 

As described in chapter 2, the self-check digit is used for numeric
fields.  If a mode of self-checking is specified, the field is checked by
the checking algorithm when information is entered.

MPE/iX 5.0 Documentation