If the value of the “Ref” element’s “DataType” attribute identifies a data type with appended status byte (see Table 58, “Unsigned16_S”, “Integer16_S”, “Unsigned8_S”, “OctetString_S”), the Server shall set the StatusCode according to Table 17. If BMP Access fails for a parameter (request response of BMP Access returns error value, see [PDP], 6.2.3), the Server shall set the StatusCode to “Bad” (0x80000000).