Forms personalization with DFF for government suppliers

Good day everyone,

I need to create a form personalization for the users, but I have some issues.

Little summary of the form needed:

We need to create a personalization that base on the vendors government type, a warning message will pop up saying that it is mandatory to select a Government payment type.

The step of the Forms should goes as follow:

1- Enter the suppliers

2- If it's a government suppliers, a warning message pop ups saying that you need to select a government payment type (user click OK)

3- The DFF field (INV_SUM_FOLDER.DF) become mandatory