Hi Guy,

I use this features in an App now. If you want to use Entities and do it in the Business Layer, you should create a new Public property for your Entity and lookup through objects. The entity has a GetBusinessObject() Method in order to get the Entity´s Business Object, and the Business Object has a ParentBizObj property, so you can define in your invoice Entity something like:

public string CustName
{
    get
    {
        string custName = ""
        InvoiveObj invObj = this.GetBusinessObject() as InvoiceObj;
        if (invObj != null)
        {
            if (invObj.ParentBizObj != null)
            {
                CustomerObj custObj = invObj.ParentBizObj as CustomerObj;
                if (custObj != null && custObj.Entity != null) custName = custObj.Entity.CustomerName;
            }
        }
        return custName;
    }
}