Hi Rajesh,
Could you please confirm which documentation you are referring to? The undo button will revert any changes that have been made in the client, but have not yet been saved to the database.
From an item tearoff window, the undo button will become enabled if you have locked the item and have modifications to it without saving. Note that you may need to refresh the window after making your modifications for the undo button to become enabled.
From the main window, the undo button will become enabled when you have selected a locked item that you have made modifications to. Items that have been modified but not saved will have a yellow lock icon next to them on the main grid.
Chris
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Christopher Gillis
Aras Labs Support Engineer
