diff --git a/src/test/java/de/ozgcloud/xta/client/XtaClientITCase.java b/src/test/java/de/ozgcloud/xta/client/XtaClientITCase.java
index 1a46f59caa0198ce174501ba4fd9658611dd646a..435ea593ad3e03e7b0e3eda4d2e11a6c00caf411 100644
--- a/src/test/java/de/ozgcloud/xta/client/XtaClientITCase.java
+++ b/src/test/java/de/ozgcloud/xta/client/XtaClientITCase.java
@@ -91,8 +91,8 @@ class XtaClientITCase {
 		void setup() {
 			var messageConfig = XtaMessageExampleLoader.MessageExampleConfig.builder()
 					.messageLabel("dfoerdermittel")
-					.reader(CLIENT_IDENTIFIER1)
-					.author(CLIENT_IDENTIFIER1)
+					.reader(READER_CLIENT_IDENTIFIER1)
+					.author(READER_CLIENT_IDENTIFIER1)
 					.build();
 			message = XtaMessageExampleLoader.load(messageConfig);
 			messageId = XtaServerSetupExtensionTestUtil.sendTestMessage(client, message);
@@ -115,7 +115,7 @@ class XtaClientITCase {
 		void shouldReturnMessageWithCorrectMessageFileContent() {
 			var messageContent = extractMessageFileContent(message);
 
-			var result = client.getMessage(CLIENT_IDENTIFIER1.value(), messageId);
+			var result = client.getMessage(READER_CLIENT_IDENTIFIER1.value(), messageId);
 			var resultContent = extractMessageFileContent(result.message());
 
 			assertThat(messageContent).isEqualTo(resultContent);
@@ -124,8 +124,8 @@ class XtaClientITCase {
 		@DisplayName("should throw invalid message id exception for a closed message")
 		@Test
 		void shouldThrowInvalidMessageIdExceptionForClosedMessage() {
-			assertThatNoException().isThrownBy(() -> client.getMessage(CLIENT_IDENTIFIER1.value(), messageId));
-			assertThatThrownBy(() -> client.getMessage(CLIENT_IDENTIFIER1.value(), messageId))
+			assertThatNoException().isThrownBy(() -> client.getMessage(READER_CLIENT_IDENTIFIER1.value(), messageId));
+			assertThatThrownBy(() -> client.getMessage(READER_CLIENT_IDENTIFIER1.value(), messageId))
 					.isInstanceOf(InvalidMessageIDException.class);
 		}
 
@@ -159,8 +159,8 @@ class XtaClientITCase {
 		void beforeEach() {
 			var messageConfig = XtaMessageExampleLoader.MessageExampleConfig.builder()
 					.messageLabel("dfoerdermittel")
-					.reader(CLIENT_IDENTIFIER1)
-					.author(CLIENT_IDENTIFIER1)
+					.reader(READER_CLIENT_IDENTIFIER1)
+					.author(READER_CLIENT_IDENTIFIER1)
 					.build();
 			message = XtaMessageExampleLoader.load(messageConfig);
 		}