DFF :- Personalizing the flexfield segments is not possible through forms personalization due to below reason:

Personalizing the flexfield segments is not possible through forms personalization due to below reason:

A Flexfield is a single field in a Form but then when you click into it and it opens up the flexfields window, 
the multiple fields you see is actually a user exit with multi segment values, not form fields.
No Form Personalization events are passed to flexfield windows (user exits).
No Form Personalization events are passed to segments inside the flexfield window (user exit).

If you want to disabled the segments, you can disable the segment
in flexfield definition form(Uncheck the enabled checkbox).


The flex developer has stated this would involve a major re-write of the flex code for APPCORE
to process forms personalization rules and actions pertaining to flexfields.
One need to understand that flexfields are not assigned to a canvas, 
the flexfield UIs in forms are not native form fields but built on the fly with user exits.


Defaulting, populating, and or manipulating hidden fields for descriptive
flexfield attributes should not, and are not supported by flexfields to be
done through forms personalizations. Only Flexfields will support through
the flexfield setup and definition.

How to find Table Information and Application Name

SELECT   FT.TABLE_NAME,FT.USER_TABLE_
NAME,
           FT.DESCRIPTION TABLE_DESC,
           FAL.APPLICATION_NAME,
           FA.APPLICATION_SHORT_NAME,
           FC.COLUMN_SEQUENCE,
           FC.COLUMN_NAME,
           FC.USER_COLUMN_NAME,
           (SELECT FC.COLUMN_NAME FROM FND_PRIMARY_KEY_COLUMNS FPK
           WHERE FPK.APPLICATION_ID= FC.APPLICATION_ID
           AND   FC.TABLE_ID = FPK.TABLE_ID
           AND   FC.COLUMN_ID  = FPK.COLUMN_ID) PRIMARY_KEY_COLUMNS,
           FC.COLUMN_TYPE,
           FC.WIDTH,
           FC.PRECISION,
           FC.SCALE,
           FC.DEFAULT_VALUE,
           FC.NULL_ALLOWED_FLAG,
           FC.TRANSLATE_FLAG,
           FC.DESCRIPTION COL_DESCRIPTION,
           FC.FLEXFIELD_APPLICATION_ID,
           FC.FLEXFIELD_NAME,
           FLEXFIELD_USAGE_CODE
    FROM   FND_TABLES FT
         , FND_COLUMNS FC
         , FND_APPLICATION FA
         , FND_APPLICATION_TL FAL
   WHERE   FAL.APPLICATION_NAME = NVL(:P_APPLICATION_NAME,0) --Receivables --FC.APPLICATION_ID = 222)
   AND     FT.TABLE_NAME       = NVL(:P_TABLE_NAME,0)       --RA_CUSTOMERS --(FC.TABLE_ID = 52559)
   AND     FT.APPLICATION_ID = FC.APPLICATION_ID
   AND     FT.TABLE_ID       = FC.TABLE_ID
   AND     FT.APPLICATION_ID = FAL.APPLICATION_ID
   AND     FA.APPLICATION_ID = FAL.APPLICATION_ID
   AND     FT.TABLE_TYPE= 'T' --Transaction Data
ORDER BY   COLUMN_SEQUENCE