diff --git a/common/src/main/java/de/ozgcloud/eingang/common/vorgang/VorgangNummerSupplier.java b/common/src/main/java/de/ozgcloud/eingang/common/vorgang/VorgangNummerSupplier.java
index 510b7c92779fa39758cf3da4855a7af4dec20fe1..a4a52ef77b597954be347d80d4cca95b197d8bc6 100644
--- a/common/src/main/java/de/ozgcloud/eingang/common/vorgang/VorgangNummerSupplier.java
+++ b/common/src/main/java/de/ozgcloud/eingang/common/vorgang/VorgangNummerSupplier.java
@@ -17,10 +17,17 @@ public class VorgangNummerSupplier {
 	static final int SUFFIX_LENGTH = 6;
 
 	public String get() {
+		return get(SUFFIX_LENGTH);
+	}
+
+	public String get(int suffixLength) {
+		if (suffixLength <1){
+			throw new IllegalArgumentException("Suffix length must be at least 1");
+		}
 		var today = LocalDate.now();
 		var lastYearNumber = today.getYear() % 10;
 		return VORGANGNUMMER_TEMPLATE.formatted(lastYearNumber, today.getMonthValue(), today.getDayOfMonth(),
-				RandomStringUtils.random(SUFFIX_LENGTH, BASE30_ALPHABET));
+				RandomStringUtils.random(suffixLength, BASE30_ALPHABET));
 	}
 
 }
diff --git a/common/src/test/java/de/ozgcloud/eingang/common/vorgang/VorgangNummerSupplierTest.java b/common/src/test/java/de/ozgcloud/eingang/common/vorgang/VorgangNummerSupplierTest.java
index 2fc9a524f5e23d2bebd9721eb5612d96ad879782..dbcec9daca804529f145eea48bf4a82328f66e18 100644
--- a/common/src/test/java/de/ozgcloud/eingang/common/vorgang/VorgangNummerSupplierTest.java
+++ b/common/src/test/java/de/ozgcloud/eingang/common/vorgang/VorgangNummerSupplierTest.java
@@ -1,18 +1,18 @@
 package de.ozgcloud.eingang.common.vorgang;
 
 import static org.assertj.core.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.Mockito.*;
 
 import java.time.LocalDate;
-import java.util.Random;
 
 import org.apache.commons.lang3.RandomStringUtils;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 import org.mockito.InjectMocks;
-import org.mockito.Mock;
 import org.mockito.Spy;
-import org.springframework.test.util.ReflectionTestUtils;
 
 class VorgangNummerSupplierTest {
 
@@ -26,7 +26,25 @@ class VorgangNummerSupplierTest {
 	void shouldAddSuffix() {
 		var result = vorgangNummerSupplier.get();
 
-		assertThat(result).hasSize(11);
+		assertThat(getSuffix(result)).hasSize(VorgangNummerSupplier.SUFFIX_LENGTH);
+	}
+
+	@Test
+	void shouldHaveSuffixSize() {
+		var result = vorgangNummerSupplier.get(3);
+
+		assertThat(getSuffix(result)).hasSize(3);
+	}
+
+	@DisplayName("should throw exception when")
+	@ParameterizedTest(name = "suffix length {0}")
+	@ValueSource(ints = { -1, 0 })
+	void shouldThrowException(int suffixLength) {
+		assertThrows(IllegalArgumentException.class, () -> vorgangNummerSupplier.get(suffixLength));
+	}
+
+	private String getSuffix(String string) {
+		return string.substring(string.indexOf('-') + 1);
 	}
 
 	@Test
diff --git a/xta-adapter/src/main/java/de/ozgcloud/eingang/xta/XtaService.java b/xta-adapter/src/main/java/de/ozgcloud/eingang/xta/XtaService.java
index f862343ae394ab692575d4ab1ffa228d3bcbf799..9e60b84b7ac4ba0dafc491ae1d80742a4d002d58 100644
--- a/xta-adapter/src/main/java/de/ozgcloud/eingang/xta/XtaService.java
+++ b/xta-adapter/src/main/java/de/ozgcloud/eingang/xta/XtaService.java
@@ -19,6 +19,7 @@ import lombok.extern.log4j.Log4j2;
 class XtaService {
 
 	static final String DFOERDERMITTELANTRAG_MESSAGE_TYPE = "Geschaeftsgang.Geschaeftsgang.0201";
+	static final int VORGANG_NUMMER_SUFFIX_LENGTH = 4;
 
 	@Autowired
 	private XtaRemoteService remoteService;
@@ -58,7 +59,7 @@ class XtaService {
 	}
 
 	FormHeader setVorgangNummer(FormHeader formHeader) {
-		return formHeader.toBuilder().vorgangNummer(vorgangNummerSupplier.get()).build();
+		return formHeader.toBuilder().vorgangNummer(vorgangNummerSupplier.get(VORGANG_NUMMER_SUFFIX_LENGTH)).build();
 	}
 
 	public void acknowledgeReceive(@NonNull XtaMessageId messageId) {
diff --git a/xta-adapter/src/test/java/de/ozgcloud/eingang/xta/XtaServiceTest.java b/xta-adapter/src/test/java/de/ozgcloud/eingang/xta/XtaServiceTest.java
index 58b6fcaa1179a3022a7fb7cca77e5f4a121c8982..d1fc3de86803ba5fc9c49a574011b41adf8e3be0 100644
--- a/xta-adapter/src/test/java/de/ozgcloud/eingang/xta/XtaServiceTest.java
+++ b/xta-adapter/src/test/java/de/ozgcloud/eingang/xta/XtaServiceTest.java
@@ -188,13 +188,13 @@ class XtaServiceTest {
 		void shouldCallVorgangNummerSupplier() {
 			service.setVorgangNummer(FormHeaderTestFactory.create());
 
-			verify(vorgangNummerSupplier).get();
+			verify(vorgangNummerSupplier).get(XtaService.VORGANG_NUMMER_SUFFIX_LENGTH);
 		}
 
 		@Test
 		void shouldSetVorgangNummer() {
 			var vorgangNummer = "vorgang-1";
-			when(vorgangNummerSupplier.get()).thenReturn(vorgangNummer);
+			when(vorgangNummerSupplier.get(anyInt())).thenReturn(vorgangNummer);
 
 			var result = service.setVorgangNummer(FormHeaderTestFactory.create());