This model tests whether the Modelica translator substitutes the
inverse function for
Annex60.Fluid.BaseClasses.FlowModels.basicFlowFunction_m_flow.
Specifically, this function declares in its annotation
section
that its inverse is provided by
Annex60.Fluid.BaseClasses.FlowModels.basicFlowFunction_dp.
Translating this model should therefore give no nonlinear equations
after the symbolic manipulation.