Invalid Data Not all COBOL data is valid for the RDBMS. Database Bridge remaps invalid data in the following way: • if NULL is read from the database, they're stored as spaces in alphanumeric COBOL items and zero in numeric COBOL items. • If numeric COBOL fields contain alphabetic digits, spaces, low-values or high-values, they're automatically converted according to the MOVE statement rules. Space is converted to zero, “A” to 1, and so on... If the -n option is used while parsing EFDs with edbiis, zero will be written when non-numeric data is encountered.