BJTU234E ROW NUMBER rownum: field_name FIELD HAS POSITIVE VALUE. ONLY NEGATIVE VALUES ARE ALLOWED DURING MOD ACTION.
The specified field from the specified row contains an invalid value. A positive value was specified, and only negative values are valid during a MODIFY action.
The utility terminates with the return code RC=12.
Specify a valid value in the field and run the utility again. Check that the row number has an appropriate negative value for the field. Check that you're not trying to perform a MOD action on a record extracted with PREP4CLON(YES) option.