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Resolved in https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippjobprinterext3v11-20190710-5100.13.docx
printer-supply[1] = ... colorantindex=4;colorantrole=process;colorantname=cyan;coloranttonality=128; printer-supply[2] = ... colorantindex=4;colorantrole=process;colorantname=magenta;coloranttonality=128; Assuming both supplies belong to the same device, either the colorantIndex has to differ, or the colorantname has to be the same.