When you specify *RCD for the INCCHAR parameter, the copy command does not perform any conversions on the input string. The command compares the byte string that you entered at the specified position in the record buffer of the from-file.
When you specify a field name, the command assumes that the input string is in the CCSID of the job in which the copy command runs. The input string is converted to the CCSID of the from-field. If no conversion table is defined or if an error occurs while converting the input string, a message is sent and the copy operation ends. If the command can correctly convert the value, the command uses the converted value for record selection.