Page protection violation when switching tab in apex

Good Day MASTER,
Got my Application running in apex with Oracle 11g XE
when i am in the tab of inventory
then i want to view the beginning inventory
then i click the Beginning Inventory it will shown up a error like this:
"Page protection violation: This may be caused by manual alteration of protected page items. If you are unsure what caused this error, please contact the application administrator for assistance.
Contact your application administrator."
but when i log - out in application it will be okay.. but when i access again the inventory to beginning inventory
it will shown the error..
its so annoying dont know what to do..
please help MASTER'S

Hi Mike,
This error may be because of of some hidden item you have created and made it protected.
Now while navigating you are updating that hidden item.
Kindly check hidden items on your pages.
Abhishek

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