I believe you are using Customer Standard pages in R12?
Flexfields at address level are generally saved on HZ_PARTY_SITES dff.
Person profile flexfields are available on customers online screen .. not sure about customer standard pages.
you might already know this.. but just a quick trick here
- Ask your DBA to set profile "Personalize Self-Service Defn" to "Y" for you in Development instance .
- After this, each OAF page will have "About this page" link on left bottom.
- Clicking this link and going down will show you all the Flexfield details shown on the page.