ERP_Distribution/Distribution/Models/Invoice.cs

using System.ComponentModel.DataAnnotations.Schema;

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

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

        public Guid CreatedByUserId { get; set; }
        [ForeignKey("CreatedByUserId")]
        public User CreatedByUser { get; set; }

        public DateTime? PrintedAt { get; set; }
        public Guid? PrintedByUserId { get; set; }
        [ForeignKey("PrintedByUserId")]
        public User? PrintedByUser { get; set; }

        public DateTime? FinalizedAt { get; set; }
        public Guid? FinalizedByUserId { get; set; }
        [ForeignKey("FinalizedByUserId")]
        public User? FinalizedByUser { get; set; }

        /// <summary>Reflects current PO line items through Draft/Printed; locked at Finalized.</summary>
        public decimal TotalAmount { get; set; }
    }
}