Method to initialise the SCO for use using an existing object of the same or compatible type.
@param value the object from which to copy the value.
@param forInsert Whether the object needs inserting in the datastore with this value
@param forUpdate Whether the object needs updating in the datastore with this value
@throws ClassCastException Thrown if the given object is not of a type that's compatible with thissecond-class wrapper object.
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