ERP_Distribution/Distribution/Models/SupplierPayment.cs

using System.ComponentModel.DataAnnotations.Schema;

namespace Distribution.Models
{
    public class SupplierPayment : Template
    {
        public Guid FK_SupplierId { get; set; }
        [ForeignKey("FK_SupplierId")]
        public Supplier? Supplier { get; set; }

        public decimal Amount { get; set; }

        // Only Cash or Cheque are valid for outgoing payments. Credit is rejected at the service layer.
        public PaymentMethod Method { get; set; }

        // Cash: required. Null for Cheque.
        public Guid? FK_BankAccountId { get; set; }
        [ForeignKey("FK_BankAccountId")]
        public BankAccount? BankAccount { get; set; }

        // Cheque: required — the ChequePage this payment issued. Null for Cash.
        public Guid? FK_ChequePageId { get; set; }
        [ForeignKey("FK_ChequePageId")]
        public ChequePage? ChequePage { get; set; }

        public DateTime PaidAt { get; set; }
        public Guid? PaidByUserId { get; set; }
        public string? Notes { get; set; }

        public ICollection<SupplierPaymentGRN> Allocations { get; set; } = [];
    }
}