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A related concept is when another bean wants to have a possible veto over a change to a property.
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The set method of the property throws an exception called java.beans.PropertyVetoException.
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The object must also support (by having add and remove methods) a VetoableChangeListener.
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Then each bean that wants to be able to veto property changes implements VetoableChangeListener by supplying the method vetoableChange(PropertyChangeEvent e).
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If more than one bean wants to veto property changes, then it may be quite complicated to work out when to keep the old value or move to the new value.
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