How to setup a "Message Text Input"

Hello,

I'm adding a oaf personalization. My goal is: show descriptive flexfield attributes in the grid and make them updatable and I want them be saved in its table.

So, I can show this attributtes and see them in the grid, I put data in the field but it's not saved!

I'm using: "Message Text Input", with this characteristics:

*ID= ATT1_VAL
Admin Personalization= True
Data Type= VARCHAR2
Disable Server Side Validation= FALSE
Disabled= FALSE
Height=1
Initial Sort Sequence= None
No Wrap= FALSE
Read Only= FALSE
Rendered=TRUE
Required=NO
Scope= .
Search Allowed= FALSE
Secret= FALSE
Selective Search Criteria= FALSE