How to know previous navigation item during runtime in Forms

Hi,
How can one know the previous navigation item in oracle forms.
Scenario:
Navigation: US Super HRMS Manager --> People --> Enter and Maintain.
On the Find Person window --> Query a Person
On the People Window, there is an Assignment Button. When clicked, it will open new window "Assignment".
At this point 'WHEN-NEW-ITEM-INSTANCE' is fired for the item 'ASSGT. ORGANIZATION_NAME'.
There is DFF on this window and when DFF is closed by pressing OK button, 'WHEN-NEW-ITEM-INSTANCE' is fired again for the item 'ASSGT. ORGANIZATION_NAME'.
Hence my question is how to know if the previous item is DFF or not.
Thanks in Advance.
Vishnu

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