DICOM PS3.3 2019a - Information Object Definitions
C.8.8.29.6 Autosequence Flag

Autosequence Flag (0074,1025) shall not be present when the Beam Order Index (0074,1324) is not present. The first treatment Beam (Beam Task Type (0074,1022) is not VERIFY) as specified by the Beam Order Index (0074,1324), shall have an Autosequence Flag (0074,1025) value of NO.

DICOM PS3.3 2019a - Information Object Definitions