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Each menu belongs either to the Main menu system or to the Popup menu system, but cannot belong to both.
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A menu in the Main system can appear only once. i.e. it cannot be a sub-menu of several menus.
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A menu in the Popup system may appear only once in a given popup tree, but may be used in any number of popup trees.
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A menu cannot reference itself, either directly as a pullright of one of its own fields or be a pullright of another menu in its own menu tree.
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