Returns the original value of a parameter according to the following:
(a) If the parameter is an overridden parameter (ie., another parameter value defined in an
Override is currently driving this parameter value), this property returns
the value that the parameter originally had before the Override was set (equivalent to what
Parameter.Value returns).
(b) If the parameter is an overriding parameter (ie., this parameter is defined on an
Override) and the overriding value has been set, this property returns the
value that the overridden parameter originally had (before the Override was set).
(c) If the parameter is an overriding parameter but the overriding value has not yet been set,
this property returns an empty value.
(d) If the parameter is neither overriding nor overridden, this property returns the same as
what Parameter.Value returns.
Warning: You must first set the overriding parameter value with the SetValue
command to activate the overridden parameter. Parameter.Value does not activate
the override parameter.
Note: This property is read-only. You cannot explicitly set the original value.
