Using CreateTime and RETIRETIME in a temporal query instread of WM_VALID

Hello every one!
I created a version enabled table using the workspace manager that supports both the valid time and transaction time. I implemented a really simple temporal query:
SELECT ID as instanceID, WM_VALID as VT, num
FROM Employee AS OF TIMESTAMP (SYSTIMESTAMP) emp
WHERE(emp.WM_VALID.validfrom<TO_DATE('13-11-2010', 'MM-DD-YYYY') AND TO_DATE('13-11-2010', 'MM-DD-YYYY')<emp.WM_VALID.validtill)
OR (emp.WM_VALID.validfrom>=TO_DATE('13-11-2010', 'MM-DD-YYYY') AND emp.WM_VALID.validfrom < TO_DATE('28-11-2010', 'MM-DD-YYYY'))
ORDER BY instanceID;
When I look into the execution plan, I find that instad of using the terms "validfrom" and "validtill", Oracle use other terms "VT.sys_NC00010$" and "VT.sys_NC00011$". I supposed that they represent the two endpoints of the interval WM_VALID. However when I take a look at the definition of the index "Employee_TI$", I find that the two terms (the prefix "VT." does not appear in the index definition)are alias of the attributes "CreateTime" and "RETIRETIME" and not WM_VALID.validfrom and WM_VALID.validtill.
I will be grateful if someone could help me to understand why Oracle uses transaction time (CreateTime and RETIRETIME) instead of WM_VALID.
Thanks
Jean

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Execution Steps:
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