diff --git a/src/main/java/eu/europa/ted/eforms/sdk/entity/SdkNoticeSubtype.java b/src/main/java/eu/europa/ted/eforms/sdk/entity/SdkNoticeSubtype.java
index 0deb351..d7a1708 100644
--- a/src/main/java/eu/europa/ted/eforms/sdk/entity/SdkNoticeSubtype.java
+++ b/src/main/java/eu/europa/ted/eforms/sdk/entity/SdkNoticeSubtype.java
@@ -1,26 +1,45 @@
 package eu.europa.ted.eforms.sdk.entity;
 
 import java.util.Objects;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 import com.fasterxml.jackson.databind.JsonNode;
 
 /**
  * Represents a notice subtype from the SDK's notice-types.json file.
  */
 public abstract class SdkNoticeSubtype implements Comparable<SdkNoticeSubtype> {
+  private static final Pattern ID_PATTERN = Pattern.compile("^([A-Za-z_-]*)(\\d+)([A-Za-z_-][A-Za-z0-9_-]*)?$");
+
   private final String subTypeId;
   private final String documentType;
   private final String type;
+  private final String prefix;
+  private final int number;
+  private final String suffix;
 
   protected SdkNoticeSubtype(String subTypeId, String documentType, String type) {
     this.subTypeId = subTypeId;
     this.documentType = documentType;
     this.type = type;
+
+    Matcher m = ID_PATTERN.matcher(subTypeId != null ? subTypeId : "");
+    if (m.matches()) {
+      this.prefix = m.group(1);
+      this.number = Integer.parseInt(m.group(2));
+      this.suffix = m.group(3) != null ? m.group(3) : "";
+    } else {
+      this.prefix = subTypeId != null ? subTypeId : "";
+      this.number = 0;
+      this.suffix = "";
+    }
   }
 
   protected SdkNoticeSubtype(JsonNode json) {
-    this.subTypeId = json.get("subTypeId").asText(null);
-    this.documentType = json.get("documentType").asText(null);
-    this.type = json.get("type").asText(null);
+    this(json.get("subTypeId").asText(null),
+        json.get("documentType").asText(null),
+        json.get("type").asText(null));
   }
 
   /**
@@ -60,7 +79,15 @@ public boolean equals(Object obj) {
 
   @Override
   public int compareTo(SdkNoticeSubtype o) {
-    return this.subTypeId.compareTo(o.subTypeId);
+    int cmp = this.prefix.compareTo(o.prefix);
+    if (cmp != 0) {
+      return cmp;
+    }
+    cmp = Integer.compare(this.number, o.number);
+    if (cmp != 0) {
+      return cmp;
+    }
+    return this.suffix.compareTo(o.suffix);
   }
 
   @Override