DICOM PS3.3 2025a - Information Object Definitions
C.39.8.2 Referenced Sample Position

Referenced Sample Positions (0040,A132) may be used only if Referenced Waveform Channels (0040,A0B0) in the enclosing dataset refers to channels within a single multiplex group. The sample position is by channel, and applies to all channels specified in Referenced Channels (0040,A0B0) in the enclosing dataset.

DICOM PS3.3 2025a - Information Object Definitions