diff --git a/MaLoIdentModels/MaLoIdentModels/Address.cs b/MaLoIdentModels/MaLoIdentModels/Address.cs
index c31af15..78eb07b 100644
--- a/MaLoIdentModels/MaLoIdentModels/Address.cs
+++ b/MaLoIdentModels/MaLoIdentModels/Address.cs
@@ -5,6 +5,10 @@ namespace MaLoIdentModels;
 
 public class Address
 {
+    [JsonIgnore]
+    [Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("countryCode")]
     [RegularExpression(@"[A-Z]{2}")]
     public string? CountryCode { get; set; }
diff --git a/MaLoIdentModels/MaLoIdentModels/DataControllableResource.cs b/MaLoIdentModels/MaLoIdentModels/DataControllableResource.cs
index 18a9379..adca854 100644
--- a/MaLoIdentModels/MaLoIdentModels/DataControllableResource.cs
+++ b/MaLoIdentModels/MaLoIdentModels/DataControllableResource.cs
@@ -1,10 +1,15 @@
 using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
 using System.Text.Json.Serialization;
 
 namespace MaLoIdentModels;
 
 public class DataControllableResource
 {
+    [JsonIgnore]
+    [Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("srId")]
     public string? SrId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/DataMarketLocation.cs b/MaLoIdentModels/MaLoIdentModels/DataMarketLocation.cs
index fa4d7ec..df81389 100644
--- a/MaLoIdentModels/MaLoIdentModels/DataMarketLocation.cs
+++ b/MaLoIdentModels/MaLoIdentModels/DataMarketLocation.cs
@@ -5,6 +5,10 @@ namespace MaLoIdentModels;
 
 public class DataMarketLocation
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("maloId")]
     public string? MaloId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/DataMarketLocationProperties.cs b/MaLoIdentModels/MaLoIdentModels/DataMarketLocationProperties.cs
index a3e9501..300323c 100644
--- a/MaLoIdentModels/MaLoIdentModels/DataMarketLocationProperties.cs
+++ b/MaLoIdentModels/MaLoIdentModels/DataMarketLocationProperties.cs
@@ -6,6 +6,10 @@ namespace MaLoIdentModels;
 
 public class DataMarketLocationProperties
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("marketLocationProperty")]
     public MarketLocationProperty MarketLocationProperty { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/DataMeterLocation.cs b/MaLoIdentModels/MaLoIdentModels/DataMeterLocation.cs
index 8dcc249..e49e02c 100644
--- a/MaLoIdentModels/MaLoIdentModels/DataMeterLocation.cs
+++ b/MaLoIdentModels/MaLoIdentModels/DataMeterLocation.cs
@@ -5,6 +5,10 @@ namespace MaLoIdentModels;
 
 public class DataMeterLocation
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("meloId")]
     public string? MeloId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/DataNetworkLocation.cs b/MaLoIdentModels/MaLoIdentModels/DataNetworkLocation.cs
index 72048c5..75a12c0 100644
--- a/MaLoIdentModels/MaLoIdentModels/DataNetworkLocation.cs
+++ b/MaLoIdentModels/MaLoIdentModels/DataNetworkLocation.cs
@@ -5,6 +5,10 @@ namespace MaLoIdentModels;
 
 public class DataNetworkLocation
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("neloId")]
     public string? NeloId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/DataTechnicalResource.cs b/MaLoIdentModels/MaLoIdentModels/DataTechnicalResource.cs
index 0de719f..14014d9 100644
--- a/MaLoIdentModels/MaLoIdentModels/DataTechnicalResource.cs
+++ b/MaLoIdentModels/MaLoIdentModels/DataTechnicalResource.cs
@@ -4,6 +4,10 @@ namespace MaLoIdentModels;
 
 public class DataTechnicalResource
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("trId")]
     public string? TrId { get; set; }
 }
diff --git a/MaLoIdentModels/MaLoIdentModels/DataTranche.cs b/MaLoIdentModels/MaLoIdentModels/DataTranche.cs
index af52745..61b1997 100644
--- a/MaLoIdentModels/MaLoIdentModels/DataTranche.cs
+++ b/MaLoIdentModels/MaLoIdentModels/DataTranche.cs
@@ -5,6 +5,10 @@ namespace MaLoIdentModels;
 
 public class DataTranche
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("tranchenId")]
     public string? TranchenId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/GeographicCoordinates.cs b/MaLoIdentModels/MaLoIdentModels/GeographicCoordinates.cs
index 7300167..d9005c9 100644
--- a/MaLoIdentModels/MaLoIdentModels/GeographicCoordinates.cs
+++ b/MaLoIdentModels/MaLoIdentModels/GeographicCoordinates.cs
@@ -4,6 +4,10 @@ namespace MaLoIdentModels;
 
 public class GeographicCoordinates
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("latitude")]
     public string? Latitude { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/IdentificationParameter.cs b/MaLoIdentModels/MaLoIdentModels/IdentificationParameter.cs
index e3f02e4..d069059 100644
--- a/MaLoIdentModels/MaLoIdentModels/IdentificationParameter.cs
+++ b/MaLoIdentModels/MaLoIdentModels/IdentificationParameter.cs
@@ -6,6 +6,10 @@ namespace MaLoIdentModels;
 
 public class IdentificationParameter
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonConverter(typeof(DateTimeOffsetWithTrailingZConverter))]
     [JsonPropertyName("identificationDateTime")]
     public DateTimeOffset IdentificationDateTime { get; set; }
diff --git a/MaLoIdentModels/MaLoIdentModels/IdentificationParameterIdentificationParameterAddress.cs b/MaLoIdentModels/MaLoIdentModels/IdentificationParameterIdentificationParameterAddress.cs
index ecc5b03..96f4bdb 100644
--- a/MaLoIdentModels/MaLoIdentModels/IdentificationParameterIdentificationParameterAddress.cs
+++ b/MaLoIdentModels/MaLoIdentModels/IdentificationParameterIdentificationParameterAddress.cs
@@ -5,6 +5,10 @@ namespace MaLoIdentModels;
 
 public class IdentificationParameterIdentificationParameterAddress
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("name")]
     public Name? Name { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/IdentificationParameterIdentificationParameterId.cs b/MaLoIdentModels/MaLoIdentModels/IdentificationParameterIdentificationParameterId.cs
index 7c7ac79..97e9277 100644
--- a/MaLoIdentModels/MaLoIdentModels/IdentificationParameterIdentificationParameterId.cs
+++ b/MaLoIdentModels/MaLoIdentModels/IdentificationParameterIdentificationParameterId.cs
@@ -1,10 +1,15 @@
 using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
 using System.Text.Json.Serialization;
 
 namespace MaLoIdentModels;
 
 public class IdentificationParameterIdentificationParameterId
 {
+    [JsonIgnore]
+    [Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("maloId")]
     public string? MaloId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/LandParcel.cs b/MaLoIdentModels/MaLoIdentModels/LandParcel.cs
index 6673250..04a8698 100644
--- a/MaLoIdentModels/MaLoIdentModels/LandParcel.cs
+++ b/MaLoIdentModels/MaLoIdentModels/LandParcel.cs
@@ -4,6 +4,10 @@ namespace MaLoIdentModels;
 
 public class LandParcel
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("districtName")]
     public string? DistrictName { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/MarketLocationDateTime.cs b/MaLoIdentModels/MaLoIdentModels/MarketLocationDateTime.cs
index 851168d..d6a9f8a 100644
--- a/MaLoIdentModels/MaLoIdentModels/MarketLocationDateTime.cs
+++ b/MaLoIdentModels/MaLoIdentModels/MarketLocationDateTime.cs
@@ -7,6 +7,10 @@ namespace MaLoIdentModels;
 
 public class MarketLocationDateTime
 {
+    [JsonIgnore]
+    [Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("maloId")]
     [RegularExpression(@"\d{11}")]
     public string? MaloId { get; set; }
diff --git a/MaLoIdentModels/MaLoIdentModels/MarketLocationMeasuringPointOperator.cs b/MaLoIdentModels/MaLoIdentModels/MarketLocationMeasuringPointOperator.cs
index 710327f..b17f3b6 100644
--- a/MaLoIdentModels/MaLoIdentModels/MarketLocationMeasuringPointOperator.cs
+++ b/MaLoIdentModels/MaLoIdentModels/MarketLocationMeasuringPointOperator.cs
@@ -7,6 +7,10 @@ namespace MaLoIdentModels;
 
 public class MarketLocationMeasuringPointOperator
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("marketPartnerId")]
     public long MarketPartnerId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/MarketLocationNetworkOperator.cs b/MaLoIdentModels/MaLoIdentModels/MarketLocationNetworkOperator.cs
index 6fe394f..d109e15 100644
--- a/MaLoIdentModels/MaLoIdentModels/MarketLocationNetworkOperator.cs
+++ b/MaLoIdentModels/MaLoIdentModels/MarketLocationNetworkOperator.cs
@@ -7,6 +7,10 @@ namespace MaLoIdentModels;
 
 public class MarketLocationNetworkOperator
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("marketPartnerId")]
     public long MarketPartnerId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/MarketLocationProperties.cs b/MaLoIdentModels/MaLoIdentModels/MarketLocationProperties.cs
index cf40bef..45bdecb 100644
--- a/MaLoIdentModels/MaLoIdentModels/MarketLocationProperties.cs
+++ b/MaLoIdentModels/MaLoIdentModels/MarketLocationProperties.cs
@@ -7,6 +7,10 @@ namespace MaLoIdentModels;
 
 public class MarketLocationProperties
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonConverter(typeof(JsonStringEnumConverter))]
     [JsonPropertyName("marketLocationProperty")]
     public MarketLocationProperty MarketLocationProperty { get; set; }
diff --git a/MaLoIdentModels/MaLoIdentModels/MarketLocationSupplier.cs b/MaLoIdentModels/MaLoIdentModels/MarketLocationSupplier.cs
index 758e621..750e153 100644
--- a/MaLoIdentModels/MaLoIdentModels/MarketLocationSupplier.cs
+++ b/MaLoIdentModels/MaLoIdentModels/MarketLocationSupplier.cs
@@ -7,6 +7,10 @@ namespace MaLoIdentModels;
 
 public class MarketLocationSupplier
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("marketPartnerId")]
     public long MarketPartnerId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/MarketLocationTransmissionSystemOperator.cs b/MaLoIdentModels/MaLoIdentModels/MarketLocationTransmissionSystemOperator.cs
index b2e2627..b11c1b3 100644
--- a/MaLoIdentModels/MaLoIdentModels/MarketLocationTransmissionSystemOperator.cs
+++ b/MaLoIdentModels/MaLoIdentModels/MarketLocationTransmissionSystemOperator.cs
@@ -7,6 +7,10 @@ namespace MaLoIdentModels;
 
 public class MarketLocationTransmissionSystemOperator
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("marketPartnerId")]
     public long MarketPartnerId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/MeterLocationMeasuringPointOperator.cs b/MaLoIdentModels/MaLoIdentModels/MeterLocationMeasuringPointOperator.cs
index ea17468..3a6ac47 100644
--- a/MaLoIdentModels/MaLoIdentModels/MeterLocationMeasuringPointOperator.cs
+++ b/MaLoIdentModels/MaLoIdentModels/MeterLocationMeasuringPointOperator.cs
@@ -7,6 +7,10 @@ namespace MaLoIdentModels;
 
 public class MeterLocationMeasuringPointOperator
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("marketPartnerId")]
     public long MarketPartnerId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/Name.cs b/MaLoIdentModels/MaLoIdentModels/Name.cs
index 7a0b942..ff04cae 100644
--- a/MaLoIdentModels/MaLoIdentModels/Name.cs
+++ b/MaLoIdentModels/MaLoIdentModels/Name.cs
@@ -4,6 +4,10 @@ namespace MaLoIdentModels;
 
 public class Name
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("surnames")]
     public string? Surnames { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/NetworkLocationMeasuringPointOperator.cs b/MaLoIdentModels/MaLoIdentModels/NetworkLocationMeasuringPointOperator.cs
index dcb6a96..5940059 100644
--- a/MaLoIdentModels/MaLoIdentModels/NetworkLocationMeasuringPointOperator.cs
+++ b/MaLoIdentModels/MaLoIdentModels/NetworkLocationMeasuringPointOperator.cs
@@ -7,6 +7,10 @@ namespace MaLoIdentModels;
 
 public class NetworkLocationMeasuringPointOperator
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("marketPartnerId")]
     public long MarketPartnerId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/ResultNegative.cs b/MaLoIdentModels/MaLoIdentModels/ResultNegative.cs
index 896d763..a606d28 100644
--- a/MaLoIdentModels/MaLoIdentModels/ResultNegative.cs
+++ b/MaLoIdentModels/MaLoIdentModels/ResultNegative.cs
@@ -5,6 +5,10 @@ namespace MaLoIdentModels;
 
 public class ResultNegative
 {
+    [JsonIgnore]
+    [Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("decisionTree")]
     [RegularExpression(@"E_\d{4}")]
     public string? DecisionTree { get; set; }
diff --git a/MaLoIdentModels/MaLoIdentModels/ResultPositive.cs b/MaLoIdentModels/MaLoIdentModels/ResultPositive.cs
index e5e8920..3c3e327 100644
--- a/MaLoIdentModels/MaLoIdentModels/ResultPositive.cs
+++ b/MaLoIdentModels/MaLoIdentModels/ResultPositive.cs
@@ -6,6 +6,10 @@ namespace MaLoIdentModels;
 
 public class ResultPositive
 {
+    [JsonIgnore]
+    [Key]
+    public System.Guid? Id { get; set; }
+
     [JsonPropertyName("dataMarketLocation")]
     public DataMarketLocation? DataMarketLocation { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/SrMarketPartner.cs b/MaLoIdentModels/MaLoIdentModels/SrMarketPartner.cs
index fb0a8eb..626ec6d 100644
--- a/MaLoIdentModels/MaLoIdentModels/SrMarketPartner.cs
+++ b/MaLoIdentModels/MaLoIdentModels/SrMarketPartner.cs
@@ -7,6 +7,10 @@ namespace MaLoIdentModels;
 
 public class SrMarketPartner
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("marketPartnerId")]
     public long MarketPartnerId { get; set; }
 
diff --git a/MaLoIdentModels/MaLoIdentModels/TrancheSupplier.cs b/MaLoIdentModels/MaLoIdentModels/TrancheSupplier.cs
index 4ca94ec..8eb5592 100644
--- a/MaLoIdentModels/MaLoIdentModels/TrancheSupplier.cs
+++ b/MaLoIdentModels/MaLoIdentModels/TrancheSupplier.cs
@@ -5,6 +5,10 @@ namespace MaLoIdentModels;
 
 public class TrancheSupplier
 {
+    [JsonIgnore]
+    [System.ComponentModel.DataAnnotations.Key]
+    public Guid? Id { get; set; }
+
     [JsonPropertyName("marketPartnerId")]
     public long MarketPartnerId { get; set; }