TaskParentUID Column is the predeccors UID in the Reporting.MSP_EPMTask
table. I'm not aware of a similar column for the successors, but you will be
able to enumerate the successor using the column above using TSQL.
I'm pretty sure that the Parent UID refers to the task above this task
in the outline structure of the project. For the "root" summary task
0, this usually refers back to the task itself.
Predecessor and successor are not in the reporting database. With the
usual cautions that the schema is subject to change, head to the draft
or published databases.
James Fraser