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Multiphase Eulerian Model with outflow boundary?

Multiphase Eulerian Model with outflow boundary?

(OP)
I looked up the chapters introducing Multiphase Models of tutorial .

In the chapter "Tutorial Guide/Using the Mixture and Eulerian Multiphase Models," Mixture Model and Eulerian model are using velocity inlet and outflow boundaries for steady simulation.

However, in the chapter " User's Guide/Cell Zone and Boundary Conditions/Boundary Conditions/Outflow Boundary Conditions," it said that

outflow boundaries cannot be used in the following cases:
1.If a problem includes pressure inlet boundaries; use pressure outlet boundary conditions (see Pressure Outlet Boundary Conditions) instead.
2.If you are modeling compressible flow.
3.If you are modeling unsteady flows with varying density, even if the flow is incompressible.
4.With the multiphase models (Eulerian, mixture, and VOF (except when modeling open channel flow, as described in Open Channel Flow n the Theory Guide).

I don't understand. They are opposite.
What are the principles when using Eulerian model and outflow boundary?

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