diff --git a/src/main/java/eu/mulk/mulkcms2/entity/ArticleBranchTipPK.java b/src/main/java/eu/mulk/mulkcms2/entity/ArticleBranchTipPK.java
index 2508f87..6472a8d 100644
--- a/src/main/java/eu/mulk/mulkcms2/entity/ArticleBranchTipPK.java
+++ b/src/main/java/eu/mulk/mulkcms2/entity/ArticleBranchTipPK.java
@@ -1,6 +1,7 @@
 package eu.mulk.mulkcms2.entity;
 
 import java.io.Serializable;
+import java.util.Objects;
 import javax.persistence.Column;
 import javax.persistence.Id;
 
@@ -28,4 +29,21 @@
   public void setRevisionId(int revisionId) {
     this.revisionId = revisionId;
   }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (!(o instanceof ArticleBranchTipPK)) {
+      return false;
+    }
+    ArticleBranchTipPK that = (ArticleBranchTipPK) o;
+    return articleId == that.articleId && revisionId == that.revisionId;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(articleId, revisionId);
+  }
 }
diff --git a/src/main/java/eu/mulk/mulkcms2/entity/ArticleRevisionCharacteristicPK.java b/src/main/java/eu/mulk/mulkcms2/entity/ArticleRevisionCharacteristicPK.java
index 2da588e..edaaff1 100644
--- a/src/main/java/eu/mulk/mulkcms2/entity/ArticleRevisionCharacteristicPK.java
+++ b/src/main/java/eu/mulk/mulkcms2/entity/ArticleRevisionCharacteristicPK.java
@@ -1,6 +1,7 @@
 package eu.mulk.mulkcms2.entity;
 
 import java.io.Serializable;
+import java.util.Objects;
 import javax.persistence.Id;
 
 public class ArticleRevisionCharacteristicPK implements Serializable {
@@ -24,4 +25,22 @@
   public void setArticleRevisionId(int articleRevisionId) {
     this.articleRevisionId = articleRevisionId;
   }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (!(o instanceof ArticleRevisionCharacteristicPK)) {
+      return false;
+    }
+    ArticleRevisionCharacteristicPK that = (ArticleRevisionCharacteristicPK) o;
+    return articleRevisionId == that.articleRevisionId
+        && Objects.equals(characteristic, that.characteristic);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(characteristic, articleRevisionId);
+  }
 }