What exactly is token validation?

Hi All,
We're using jdev 10.1.2, adf bc's and jsps. A user keeps using the back button and so sporadically gets the error 'row currency has changed since user interface was rendered'. Having researched it on this site, I've found that this is due to token validation.
Can someone please define what exactly is token validation and is it ok to turn it off?
Many thanks,
Liz.

Token validation is the mechanism that's used to detect back button presses.
Basically as the user navigates through pages by communicating to the server, the ADF engine allocates each page pushed back to the user a unique token value. Each time the user requests a new page, the previous token is given back to the server. The server checks the token it received against the token it passed out, and if they match the user hasn't used the back button. If they don't match, it occurs because when user navigates to page A they get token X, then they navigate to page B they get token Y, and next they press back button which returns to the browser's cached version of page A with token X. Next the user does a real submit back to the server and token X is passed back. The server was expecting token Y so it throws the row currency error you're seeing.
It is not advisable to turn it off, but instead instruct your users not to use the back button. A common technique to stop this occuring is to launch the app in a browser window that doesn't have the associated toolbar.
Hope this helps.
CM.

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Deliver Documents due for Delivery and Display Deliveries
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User-specific settings
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in your post, you also said..
The below code is the WHEN_BUTTON_PRESSED Trigger for the ENTER_QUERY (Push Button):
We see 3 button in your code. How can we know which one is ENTER_QUERY button. Your code says...
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