diff --git a/basyx.submodelrepository/basyx.submodelrepository-core/src/test/java/org/eclipse/digitaltwin/basyx/submodelrepository/core/SubmodelRepositorySuite.java b/basyx.submodelrepository/basyx.submodelrepository-core/src/test/java/org/eclipse/digitaltwin/basyx/submodelrepository/core/SubmodelRepositorySuite.java
index cc38fe32f..05df402e7 100644
--- a/basyx.submodelrepository/basyx.submodelrepository-core/src/test/java/org/eclipse/digitaltwin/basyx/submodelrepository/core/SubmodelRepositorySuite.java
+++ b/basyx.submodelrepository/basyx.submodelrepository-core/src/test/java/org/eclipse/digitaltwin/basyx/submodelrepository/core/SubmodelRepositorySuite.java
@@ -26,6 +26,7 @@
 package org.eclipse.digitaltwin.basyx.submodelrepository.core;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
@@ -33,11 +34,13 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.Set;
 
 import org.eclipse.digitaltwin.aas4j.v3.model.DataTypeDefXsd;
 import org.eclipse.digitaltwin.aas4j.v3.model.OperationVariable;
 import org.eclipse.digitaltwin.aas4j.v3.model.Property;
 import org.eclipse.digitaltwin.aas4j.v3.model.Submodel;
+import org.eclipse.digitaltwin.aas4j.v3.model.SubmodelElement;
 import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultProperty;
 import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultSubmodel;
 import org.eclipse.digitaltwin.basyx.core.exceptions.CollidingIdentifierException;
@@ -53,8 +56,11 @@
 import org.eclipse.digitaltwin.basyx.submodelservice.SubmodelServiceHelper;
 import org.eclipse.digitaltwin.basyx.submodelservice.SubmodelServiceSuite;
 import org.eclipse.digitaltwin.basyx.submodelservice.value.PropertyValue;
+import org.eclipse.digitaltwin.basyx.submodelservice.value.SubmodelValueOnly;
 import org.junit.Test;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
+
 /**
  * Testsuite for implementations of the SubmodelRepository interface
  * 
@@ -65,6 +71,7 @@ public abstract class SubmodelRepositorySuite extends SubmodelServiceSuite {
 	private static final PaginationInfo NO_LIMIT_PAGINATION_INFO = new PaginationInfo(null, null);
 	private static final String EMPTY_ID = " ";
 	private static final String NULL_ID = null;
+	private static final String ID = "testIdNew";
 
 	protected abstract SubmodelRepository getSubmodelRepository();
 
@@ -258,6 +265,59 @@ public void getPaginatedSubmodel() {
 		CursorResult<List<Submodel>> cursorResult = repo.getAllSubmodels(new PaginationInfo(1, ""));
 		assertEquals(1, cursorResult.getResult().size());
 	}
+	
+	@Test
+	public void getSubmodelByIdMetadata() throws JsonProcessingException {
+		SubmodelRepository repo = getSubmodelRepository();
+		Submodel expectedSubmodel = buildDummySubmodelWithNoSmElement(ID); 
+		repo.createSubmodel(expectedSubmodel);
+		
+		Submodel retrievedSubmodel = repo.getSubmodelByIdMetadata(ID);
+
+		assertEquals(expectedSubmodel,retrievedSubmodel);
+	}
+	
+	@Test
+	public void getSubmodelByIdValueOnly() {
+		SubmodelRepository repo = getSubmodelRepository();
+		Submodel submodel = buildDummySubmodelWithNoSmElement(ID);
+
+		List<SubmodelElement> submodelElements = buildDummySubmodelElements();
+		submodel.setSubmodelElements(submodelElements);
+		repo.createSubmodel(submodel);
+
+		SubmodelValueOnly expectedSmValueOnly = new SubmodelValueOnly(submodelElements);
+		SubmodelValueOnly retrievedSmValueOnly = repo.getSubmodelByIdValueOnly(ID);
+
+		assertSameSubmodelValueOnly(expectedSmValueOnly,retrievedSmValueOnly);
+	}
+	
+	private void assertSameSubmodelValueOnly(SubmodelValueOnly expectedSmValueOnly,
+			SubmodelValueOnly retrievedSmValueOnly) {		
+		assertNotNull(retrievedSmValueOnly);
+		
+		Set<String> expectedSubmodelElementsIds = expectedSmValueOnly.getValuesOnlyMap().keySet();
+		Set<String> retrievedSubmodelElementsIds = retrievedSmValueOnly.getValuesOnlyMap().keySet();
+		assertEquals(expectedSubmodelElementsIds, retrievedSubmodelElementsIds);	
+	}
+	
+	@Override
+	@Test
+	public void patchSubmodelElements() {
+		SubmodelRepository repo = getSubmodelRepository();
+		Submodel submodel = buildDummySubmodelWithNoSmElement(ID);
+		
+		List<SubmodelElement> submodelElements = buildDummySubmodelElements();
+		submodel.setSubmodelElements(submodelElements);
+		repo.createSubmodel(submodel);
+		
+		List<SubmodelElement> submodelElementsPatch = buildDummySubmodelElementsToPatch();		
+		repo.patchSubmodelElements(ID,submodelElementsPatch);
+		
+		Submodel patchedSubmodel = repo.getSubmodel(ID);
+		assertEquals(submodel.getSubmodelElements().size(),patchedSubmodel.getSubmodelElements().size());
+		assertEquals(submodelElementsPatch, patchedSubmodel.getSubmodelElements());
+	}
 
 	// Has to be overwritten if backend does not support operations
 	@Test
diff --git a/basyx.submodelservice/basyx.submodelservice-core/src/test/java/org/eclipse/digitaltwin/basyx/submodelservice/SubmodelServiceSuite.java b/basyx.submodelservice/basyx.submodelservice-core/src/test/java/org/eclipse/digitaltwin/basyx/submodelservice/SubmodelServiceSuite.java
index 495533893..df99a2722 100644
--- a/basyx.submodelservice/basyx.submodelservice-core/src/test/java/org/eclipse/digitaltwin/basyx/submodelservice/SubmodelServiceSuite.java
+++ b/basyx.submodelservice/basyx.submodelservice-core/src/test/java/org/eclipse/digitaltwin/basyx/submodelservice/SubmodelServiceSuite.java
@@ -52,8 +52,10 @@
 import org.eclipse.digitaltwin.aas4j.v3.model.SubmodelElementCollection;
 import org.eclipse.digitaltwin.aas4j.v3.model.SubmodelElementList;
 import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultEntity;
+import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultFile;
 import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultLangStringTextType;
 import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultProperty;
+import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultSubmodel;
 import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultSubmodelElementCollection;
 import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultSubmodelElementList;
 import org.eclipse.digitaltwin.basyx.core.exceptions.ElementDoesNotExistException;
@@ -89,7 +91,8 @@ public abstract class SubmodelServiceSuite {
 
 	private static final String DUMMY_JSON_1 = "{\"name\":\"SampleJsonFile\",\"description\":\"A JSON file for verification\",\"version\":1}";
 	private static final String DUMMY_JSON_2 = "{\"name\":\"SampleJsonFile\",\"description\":\"A JSON file for verification\",\"version\":2}";
-
+	private static final String ID = "testId";
+	
 	@Test
 	public void getSubmodel() {
 		Submodel technicalData = DummySubmodelFactory.createTechnicalDataSubmodel();
@@ -605,6 +608,43 @@ public void deleteNonExistingFile() throws IOException {
 
 		submodelService.deleteFileValue(SubmodelServiceHelper.SUBMODEL_TECHNICAL_DATA_FILE_ID_SHORT);
 	}
+	
+	@Test
+	public void patchSubmodelElements() {
+		
+		List<SubmodelElement> submodelElements = buildDummySubmodelElements();
+		Submodel submodel = buildDummySubmodelWithSmElement(ID, submodelElements);
+		SubmodelService submodelService = getSubmodelService(submodel);	
+		
+		List<SubmodelElement> submodelElementsPatch = buildDummySubmodelElementsToPatch();		
+		submodelService.patchSubmodelElements(submodelElementsPatch);
+		
+		Submodel patchedSubmodel = submodelService.getSubmodel();		
+		assertEquals(submodel.getSubmodelElements().size(),patchedSubmodel.getSubmodelElements().size());
+		assertEquals(submodelElementsPatch, patchedSubmodel.getSubmodelElements());
+	}
+	
+	protected Submodel buildDummySubmodelWithSmElement(String id, List<SubmodelElement> submodelElements) {
+		return new DefaultSubmodel.Builder().id(id).submodelElements(submodelElements).build();
+	}
+	
+	protected Submodel buildDummySubmodelWithNoSmElement(String id) {
+		return new DefaultSubmodel.Builder().id(id).build();
+		
+	}
+	
+	protected List<SubmodelElement> buildDummySubmodelElements() {
+	   	Property prop = new DefaultProperty.Builder().idShort("propId").value("propValue").build();
+	  	File file = new DefaultFile.Builder().idShort("fileId").contentType("contentTypeValue").value("fileValue").build();
+	   	
+	    return Arrays.asList(prop, file);
+	}
+	protected List<SubmodelElement> buildDummySubmodelElementsToPatch() {
+	   	Property prop = new DefaultProperty.Builder().idShort("propId").value("propNewValue").build();
+	  	File file = new DefaultFile.Builder().idShort("fileId").contentType("contentTypeNewValue").value("fileNewValue").build();
+	   	
+	    return Arrays.asList(prop, file);
+	}
 
 	private void assertStoredFileContentEquals(SubmodelService submodelService, String fileIdShort, String content) throws IOException {
 		java.io.File retrievedValue = submodelService.getFileByPath(fileIdShort);