Additional Notes on Field and Format Names
If the generated field name is a COBOL reserved word, the suffix -DDS is added to the field name. If the generated field name originates from a physical file (in other words, the field is an argument of the CONCAT or RENAME keyword), the suffix is also added. For more information, see the IBM® Rational® Development Studio for i: ILE COBOL Programmer's Guide.
The REPLACING phrase cannot be used to change the name of a key field or a format name when EXTERNALLY-DESCRIBED-KEY is used.