diff --git a/Elwig/Models/Entities/PaymentDeliveryPart.cs b/Elwig/Models/Entities/PaymentDeliveryPart.cs
index d2852ef..ab9eb42 100644
--- a/Elwig/Models/Entities/PaymentDeliveryPart.cs
+++ b/Elwig/Models/Entities/PaymentDeliveryPart.cs
@@ -16,6 +16,14 @@ namespace Elwig.Models.Entities {
         [Column("avnr")]
         public int AvNr { get; set; }
 
+        [Column("net_amount")]
+        public long NetAmountValue { get; set; }
+        [NotMapped]
+        public decimal NetAmount {
+            get => Variant.Season.DecFromDb(NetAmountValue);
+            set => NetAmountValue = Variant.Season.DecToDb(value);
+        }
+
         [Column("mod_abs")]
         public long ModAbsValue { get; set; }
         [NotMapped]
@@ -33,12 +41,9 @@ namespace Elwig.Models.Entities {
         }
 
         [Column("amount")]
-        public long? AmountValue { get; set; }
+        public long AmountValue { get; private set; }
         [NotMapped]
-        public decimal? Amount {
-            get => AmountValue != null ? Variant.Season.DecFromDb(AmountValue.Value) : null;
-            set => AmountValue = value != null ? Variant.Season.DecToDb(value.Value) : null;
-        }
+        public decimal Amount => Variant.Season.DecFromDb(AmountValue);
 
         [ForeignKey("Year, AvNr")]
         public virtual PaymentVar Variant { get; private set; }
diff --git a/Elwig/Models/Entities/PaymentMember.cs b/Elwig/Models/Entities/PaymentMember.cs
index 3bda987..d16d6c4 100644
--- a/Elwig/Models/Entities/PaymentMember.cs
+++ b/Elwig/Models/Entities/PaymentMember.cs
@@ -39,12 +39,9 @@ namespace Elwig.Models.Entities {
         }
 
         [Column("amount")]
-        public long AmountValue { get; set; }
+        public long AmountValue { get; private set; }
         [NotMapped]
-        public decimal Amount {
-            get => Variant.Season.DecFromDb(AmountValue);
-            set => AmountValue = Variant.Season.DecToDb(value);
-        }
+        public decimal Amount => Variant.Season.DecFromDb(AmountValue);
 
         [ForeignKey("Year, AvNr")]
         public virtual PaymentVar Variant { get; private set; }
diff --git a/Elwig/Models/Entities/PaymentVar.cs b/Elwig/Models/Entities/PaymentVar.cs
index 3e14733..505236c 100644
--- a/Elwig/Models/Entities/PaymentVar.cs
+++ b/Elwig/Models/Entities/PaymentVar.cs
@@ -51,6 +51,9 @@ namespace Elwig.Models.Entities {
         [InverseProperty("Variant")]
         public virtual ISet<PaymentMember> MemberPayments { get; private set; }
 
+        [InverseProperty("Variant")]
+        public virtual ISet<PaymentDeliveryPart> DeliveryPartPayments { get; private set; }
+
         [InverseProperty("Variant")]
         public virtual ISet<Credit> Credits { get; private set; }
     }