MOD-11

The MOD-11 field exit is a sample Modulus-11 check digit analysis routine which uses a sequenced weight. This MOD-11 routine employs the formula used by the federal government to create ISSN and ISBN check digits. The selected input field must be a valid zoned decimal number from 3 to 18 digits in length. Data Solutions preserves the existing sign when the field is signed numeric.

The check digit output is stored in the right-most byte of the selected field when C (Creation) is specified. The right-most byte of the selected field is checked when V (Verify) is specified. The below table describes the parameters for the MOD-11 exit.

MOD-11 Parameters

Position

Value Description

1

Specify one of the following values in the parameter field (must be uppercase):

C Create check digit (default). Data Solutions uses the field length specified in the record layout.

V Verify check digit.

2 -3

Optional. You may specify a left-justified length to override the field length specified in the record layout.

 

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