How to configure an entity to save the summed value from a nested list? - entity-framework

Question

I have two entity classes (Order, OrderItem) and one Value Object cl(Money).
Simplified code:
public class Order
{
private Order()
{
}
public int OrderId { get; private set; }
public List<OrderItem> OrderItems { get; set; } = new ();
public Money TotalGrossAmount
{
get => new Money(OrderItems.Sum(x => x.TotalNetAmount.Amount), "USD");
private set { }
}
// ...rest of code
}
public class OrderItem
{
private OrderItem()
{
}
public int OrderItemId { get; private set; }
public Money TotalNetAmount { get; private set; }
// ...rest of code
}
public class Money
{
public Money(decimal amount, string currency)
{
Amount = amount;
Currency = currency;
}
public decimal Amount { get; private set; }
public string Currency { get; private set; }
}
For efficiency purposes, I'd like to have the summed amount of the order items in the database in the Order table.
The Order entity is configured like this:
public class OrderConfiguration : IEntityTypeConfiguration<Order>
{
public void Configure(EntityTypeBuilder<Order> builder)
{
builder.ToTable(nameof(Order), DbSchemas.Default);
builder.HasKey(x => x.OrderId);
// ...rest of code
builder.OwnsOne(x => x.TotalGrossAmount, navigationBuilder =>
{
navigationBuilder.Property(p => p.Amount);
navigationBuilder.Property(p => p.Currency);
});
}
}
Migration creates the correct table structure with columns: TotalGrossAmount_Amount, TotalGrossAmount_Currency
But for this configuration, the application throws an exception:
The value of 'Order.TotalGrossAmount#Money.OrderId' is unknown when attempting to save changes. This is because the property is also part of a foreign key for which the principal entity in the relationship is not known.
How should I configure Order entities correctly?