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You can do the following:
1. Create a hidden page item, say PX_HIDE_SHOW_FLG
2. Create a Dynamic Action of the type "Set Value" on the parent item to update PX_HIDE_SHOW_FLG. You can choose the "Set Type" as "PL/SQL Function Body". The function code should return 'Y' or 'N' based on the logic (count the number of children under the selected parent). You can trigger this DA on "change" of the parent item.
3. Now, create another DA on PX_HIDE_SHOW_FLG to hide/show the child LOV item based on its value. For, example, if value (of the hidden page item) = 'Y', then hide, else show.
Thanks Rohit..now its working without any issues..