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The model cannot be referenced. An error occurs if a reference to the model occurs in another model.

The model can be referenced at most once in a model reference hierarchy. An error occurs if more than one reference exists.

The model can be referenced more than once in a hierarchy, provided that it contains no constructs that preclude multiple reference. An error occurs if the model cannot be referenced multiple times, even if only one reference exists.

To use multiple instances of a referenced model in normal mode, use the Multiple setting. For details, see Simulate Multiple Referenced Model Instances in Normal Mode.