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If flow is travelling left to right (for example) the gas composition and liquid mass will change from right to left: mass per phase is not equal on both boundaries. From memory there are some multiphase specific notes in the Periodic boundary section(s) of the User's Guide.Â
Operating density needs to be reviewed if gravity is on when you have a vertical pressure boundary: how are you accounting for hydrostatic effects? Otherwise, the settings aren't wrong - note depending on what you're trying to do you may find alternative settings are "better". That's part of the skill with multiphase models, what is important, and what can we ignore?Â