Forms Personalization of Auto Create form in Oracle Purchasing

I am facing a weird issue on Forms Personalization front.  This is in r12.1.3

My requirement is following:

1. On the standard AutoCreate form in Oracle Purchasing, click Find Button
2. List of PRs will show up
3. Select a PR and Click on the Automatic.
4. There is a field(very first field) called Global Agreement on the pop up window.
5. Requirement is to nullify the value in this field when the window opens up.

I know how to nullify the value when window opens up. But the problem I am running into is the cursor focus always ends up on the field "Supplier".  Even if I disable all personalizations, the default behavior is it positions the cursor focus straigtht on "Supplier" field.