The Primary Key for the SO_DOCUMENTATION table is the SO_DOC_SEQ column.
Jobs and Process Flows are stored in the SO_JOB_TABLE whose Primary Key is the SO_JOB_SEQ column.
The SO_DOC_SEQ and SO_JOB_SEQ columns are directly related meaning an Abort documentation which has a SO_DOC_SEQ value of 9 belongs to the Job/Process Flow which has a SO_JOB_SEQ value of 9.