pawelgradecki/IEntityWithTotalSum.cs

## IEntityWithTotalSum.cs
interface IEntityWithTotalSum
{
    decimal new_totalsum { get; set; }
    decimal new_netamount { get; set; }
    decimal new_margin { get; set; }
}

## PartialHelpers.cs
public partial class Account : IEntityWithTotalSum {}
public partial class Opportunity : IEntityWithTotalSum {}
	interface IEntityWithTotalSum
	{
	decimal new_totalsum { get; set; }
	decimal new_netamount { get; set; }
	decimal new_margin { get; set; }
	}
	public partial class Account : IEntityWithTotalSum {}
	public partial class Opportunity : IEntityWithTotalSum {}