Forms Personlization

 Hi Team,

We are using R12.1.2. Using forms personalization, what is the way to restrict a user updating a specific field.

example:

In AP Invoice workbench , GL date will default to system date, if current period is not open then to last day of latest open period.

while entering the invoice users should not update the GL Date in Invoice workbench, Lines window and distributions.

Hope this can be achieved using forms personalization. Can any one suggest how to achieve this or suggest reference documents about configuring this personalization.

Thanks & Regards,

Srini