(field)
(value)
is known as reserved in (specificiation)
ISO IEC 23003-4 (DRC):measurementSystem
: "Coding of measurementSystem field in loudnessInfo() [...] reserved, not permitted [...] Reserved Measurement System"
ISO IEC 23003-4:
If ISO/IEC 23003-3:2020 compatibility is expected, configure the encoder to use a value not listed as reserved in ISO/IEC 23003-3:2020, else contact the conformance checker developer in order to get an updated version.