Undo or CTRL-Z does not work in an item with an lov

When you change a required item of a record and this item has an LOV behind it. The required item is not validated. Because it's not validated no changes are seen by the item. So your changes can't been undone. In oracle forms the CTRL-Z combination works for the item, in the headstart demo application the CTRL-Z doesn't work and the undo button is not enabled.
The example of the multi-select LOV in the headstart demo-application (form hsd0012f) has the same problem. When you make the id item empty, you can't undo the changes.
How can I undo the changes?

Is there a way to undo the changes? What work-around can the developer add to make the undo work.

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Ctrl+Z does not work in Forms 11g on Windows (undo function)

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The ctrl+C and ctrl+V (copy/paste) work fine.
I looked into the Forms key mapping resource file and no solution there.
Thanks

I'm not sure what functionality you believe you had previously, but UNDO does not have any automatic functionality built-in. This is clearly explained in the Builder Online Help. Here is some of that text. Notice carefully what it says about "Undo":
<blockquote>Magic Item Property
<blockquote>Description_
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Undo, About
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...</blockquote>
</blockquote>

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I cannot past with the the most recent version released today. CTRL V does not work either
== This happened ==
Every time Firefox opened
== When my system updated the newest version today

Issues with the right-click context menu not working can be caused by the [http://toolbar.yahoo.com/ Yahoo Toolbar] (Tools > Add-ons > Extensions)
See:
[[Troubleshooting extensions and themes]]
http://support.mozilla.com/en-US/forum/1/380010
https://support.mozilla.com/en-US/forum/1/552540?
https://support.mozilla.com/en-US/forum/1/472971
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https://support.mozilla.com/en-US/kb/Clipboard+not+working
http://kb.mozillazine.org/JavaScript#Advanced_JavaScript_settings
http://kb.mozillazine.org/Prevent_websites_from_disabling_new_window_features
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'''Update Java''': your ver. ~~red:1.5.0_02 (very old)~~; current ver. 1.6.0.20 (important security update 04-15-2010)
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~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
See: '''[http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates Updating Java]'''
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See: http://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox#Installing_and_updating_Adobe_Reader
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~~red:-See the images at the bottom left of this post to see the steps to take on the Adobe site~~
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(71894)

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Undo or CTRL-Z does not work in an item with an lov

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