Portal Security Question

Our SAP Portal Version is NetWeaver 7.01 SP5 which uses an ABAP UME .

We are planning to implement the Security Question Feature and it has been implemented in Test systems Succesfully .

The Issue is that there are already 20,000 + Users in Portal .

What we plan to do is set "Birthdate" as default Question for users Already in the Portal so that when user goes to change his password he can give his birthdat and his password is reset .

The issue is , I do not know , which TABLE stores the Security Question and Answer .

Any Ideas !!!

Regards,

Ashish .A. Poojary