Open the Settings Editor and go to: . See setting [PDF/X output intent].
PDF/X can contain an output intent profile. An output intent profile is the profile of the device for which the PDF document has been prepared.
If the setting [PDF/X output intent] is enabled and the PDF file contains an output intent profile:
The input profile for CMYK is ignored and the PDF converter converts all other colours to the output intent profile. The PS3 interpreter then converts all colours from the output intent profile to the actual output profile.