diff --git a/Elwig/Helpers/Billing/Billing.cs b/Elwig/Helpers/Billing/Billing.cs
index 0c4d561..72bceb2 100644
--- a/Elwig/Helpers/Billing/Billing.cs
+++ b/Elwig/Helpers/Billing/Billing.cs
@@ -10,7 +10,7 @@ namespace Elwig.Helpers.Billing {
         private readonly int AvNr;
         private readonly AppDbContext Context;
         private readonly Dictionary<string, string> Attributes;
-        private readonly Dictionary<string, (decimal?, double?)> Modifiers;
+        private readonly Dictionary<string, (decimal?, decimal?)> Modifiers;
         private readonly Dictionary<string, (string, string?, string?, string?, int?, int?, decimal?)> AreaComTypes;
 
         public Billing(int year, int avnr) {
diff --git a/Elwig/Models/Modifier.cs b/Elwig/Models/Modifier.cs
index 749e8a1..77c228f 100644
--- a/Elwig/Models/Modifier.cs
+++ b/Elwig/Models/Modifier.cs
@@ -23,16 +23,18 @@ namespace Elwig.Models {
 
         [NotMapped]
         public decimal? Abs {
-            get {
-                return AbsValue != null ? Season.DecFromDb(AbsValue.Value) : null;
-            }
-            set {
-                AbsValue = value != null ? Season.DecToDb(value.Value) : null;
-            }
+            get => AbsValue != null ? Season.DecFromDb(AbsValue.Value) : null;
+            set => AbsValue = value != null ? Season.DecToDb(value.Value) : null;
         }
 
         [Column("rel")]
-        public double? Rel { get; set; }
+        public double? RelValue { get; set; }
+
+        [NotMapped]
+        public decimal? Rel {
+            get => (decimal?)RelValue;
+            set => RelValue = (double?)value;
+        }
 
         [Column("standard")]
         public bool IsStandard { get; set; }
@@ -45,7 +47,7 @@ namespace Elwig.Models {
 
         public string ValueStr =>
             (Abs != null) ? $"{Utils.GetSign(Abs.Value)}{Math.Abs(Abs.Value)}\u00a0{Season.Currency.Symbol}/kg" :
-            (Rel != null) ? $"{Utils.GetSign(Rel.Value)}{(Math.Abs(Rel.Value) < 0.1 ? "\u2007" : "")}{Math.Abs(Rel.Value):0.00##\u00a0%}" :
+            (Rel != null) ? $"{Utils.GetSign(Rel.Value)}{(Math.Abs(Rel.Value) < 0.1m ? "\u2007" : "")}{Math.Abs(Rel.Value):0.00##\u00a0%}" :
             "";
 
         public override string ToString() {