Not sure in which Integration Epicor is using it. However, setting IntRunChangeCountry to true does, it will trigger the ChgCountry BO Method when using UpdateExt
What the ChgCountry method does it sets the ShipVia, Language and FormatStr fields when the Country has changed.
If you don’t use IntRunChangeCountry then all you get is the country changed, but none of that countries default’s will populate.