How to prevent users from creating transactional problems?

Dear Sirs...
Using JDeveloper 10.1.2 and ADF UIX technology. If i created a web application that contains many pages. Assume the application contains pages A,B,C,D.
The end user should access the pages A then B then C then D to get the transaction executed and commited correctly.
the problem is:
1- if a user navigates from A to B to C then he press the Back button to A then he commits the transaction, the data would be stored in correctly.
2- if page C requires some preparations in page B (initalization of session variables) and the user enters page A then he changes the URL to C, then this would cause inproper execution of application and so the data would be stored incorrectly.
so how can i prevent the user from pressing the back button of the browser (which i do not think is possible) or how can i prevent him from making any errors by inproper page navigation?
thanks for any help in advance and best regards

I really don't know if this is the correct way of doing it, but we prevent navigation directly to any page within our application if the HTTP Referer header is null. If it's null, we redirect to a page that says the user should use the navigation buttons provided and not enter the page via bookmarks, history, or direct navigation via a typed in URL.

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