ERP_Distribution/Distribution/Models/Invoice.cs

using System.ComponentModel.DataAnnotations.Schema;

namespace Distribution.Models
{
    public class Invoice : Template
    {
        public Guid FK_ShopPOId { get; set; }
        [ForeignKey("FK_ShopPOId")]
        public ShopPO ShopPO { get; set; }

        public InvoiceStatus Status { get; set; } = InvoiceStatus.Draft;
        public PaymentStatus PaymentStatus { get; set; } = PaymentStatus.Pending;

        public Guid CreatedBy { get; set; }

        public DateTime? PrintedAt { get; set; }
        public Guid? PrintedBy { get; set; }

        public DateTime? FinalizedAt { get; set; }
        public Guid? FinalizedBy { get; set; }

        /// <summary>Scheme discount redeemed against the PO, subtracted from the billable lines to give TotalAmount.</summary>
        public decimal DiscountAmount { get; set; }

        /// <summary>Payable amount: billable lines minus DiscountAmount.</summary>
        public decimal TotalAmount { get; set; }

        public ICollection<InvoiceItem> Items { get; set; } = new List<InvoiceItem>();
        public ICollection<Payment> Payments { get; set; } = new List<Payment>();
    }
}