Changing Plant when using BO

It appears you just change it as you mentioned. (in E10 at least)

// Ice.Core.Session
public string PlantID
{
	get
	{
		return this.plantID;
	}
	set
	{
		if (string.Equals(value, this.plantID, StringComparison.OrdinalIgnoreCase))
		{
			return;
		}
		this.sessionMod.SetPlant(value, out this.plantName);
		this.plantID = value;
		this.OnSessionChanged(Session.SessionChangedItem.Plant);
	}