diff --git a/.gitignore b/.gitignore
index ecadeccfa..b2ea72595 100644
--- a/.gitignore
+++ b/.gitignore
@@ -90,3 +90,5 @@ local.properties
 /.env
 
 **.iml
+
+.DS_Store
diff --git a/basyx.aasrepository/basyx.aasrepository-http/src/test/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryHTTPSuite.java b/basyx.aasrepository/basyx.aasrepository-http/src/test/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryHTTPSuite.java
index 9b589f488..1114eb0e0 100644
--- a/basyx.aasrepository/basyx.aasrepository-http/src/test/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryHTTPSuite.java
+++ b/basyx.aasrepository/basyx.aasrepository-http/src/test/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryHTTPSuite.java
@@ -43,7 +43,6 @@
 import org.apache.hc.core5.http.ProtocolException;
 import org.apache.hc.core5.http.io.entity.EntityUtils;
 import org.eclipse.digitaltwin.aas4j.v3.dataformat.core.DeserializationException;
-import org.eclipse.digitaltwin.aas4j.v3.model.impl.DefaultAssetAdministrationShell;
 import org.eclipse.digitaltwin.basyx.http.Base64UrlEncodedIdentifier;
 import org.eclipse.digitaltwin.basyx.http.HttpBaSyxHeader;
 import org.eclipse.digitaltwin.basyx.http.pagination.Base64UrlEncodedCursor;
@@ -192,6 +191,26 @@ public void getAllAasWithIdShort() throws IOException, ParseException {
 		BaSyxHttpTestUtils.assertSameJSONContent(getPaginatedAas1JSONString(), getJSONWithoutCursorInfo(actualJsonFromServer));
 	}
 
+	@Test
+	public void getAllAasWithMultipleDifferentGlobalAssetIds() throws IOException, ParseException {
+		createMultipleAasOnServer();
+		CloseableHttpResponse retrievalResponse = getAllAasMultipleDifferentGlobalAssetIdsParam();
+		assertEquals(HttpStatus.OK.value(), retrievalResponse.getCode());
+
+		String actualJsonFromServer = BaSyxHttpTestUtils.getResponseAsString(retrievalResponse);
+		BaSyxHttpTestUtils.assertSameJSONContent(getEmptyResultJSONString(), getJSONWithoutCursorInfo(actualJsonFromServer));
+	}
+
+	@Test
+	public void getAllAasWithMultipleIdenticalGlobalAssetIds() throws IOException, ParseException {
+		createMultipleAasOnServer();
+		CloseableHttpResponse retrievalResponse = getAllAasMultipleIdenticalGlobalAssetIdsParam();
+		assertEquals(HttpStatus.OK.value(), retrievalResponse.getCode());
+
+		String actualJsonFromServer = BaSyxHttpTestUtils.getResponseAsString(retrievalResponse);
+		BaSyxHttpTestUtils.assertSameJSONContent(getPaginatedAas1JSONString(), getJSONWithoutCursorInfo(actualJsonFromServer));
+	}
+
 	@Test
 	public void deleteAas() throws IOException {
 		createDummyAasOnServer(getAas1JSONString());
@@ -423,6 +442,10 @@ public void deleteNonExistingThumbnail() throws FileNotFoundException, Unsupport
 	private String getPaginatedAas1JSONString() throws FileNotFoundException, IOException {
 		return BaSyxHttpTestUtils.readJSONStringFromClasspath("PaginatedAasSimple_1.json");
 	}
+
+	private String getEmptyResultJSONString() throws FileNotFoundException, IOException {
+		return BaSyxHttpTestUtils.readJSONStringFromClasspath("EmptyResponse.json");
+	}
 	
 	private String getJSONWithoutCursorInfo(String response) throws JsonMappingException, JsonProcessingException {
 		return BaSyxHttpTestUtils.removeCursorFromJSON(response);
@@ -489,6 +512,14 @@ protected CloseableHttpResponse getAllAasGlobalAssetIdsParam() throws IOExceptio
 		return BaSyxHttpTestUtils.executeGetOnURL(getURL()+"?assetIds=ew0KIm5hbWUiOiJnbG9iYWxBc3NldElkIiwNCiJ2YWx1ZSI6Imdsb2JhbEFzc2V0SWQiDQp9");
 	}
 
+	protected CloseableHttpResponse getAllAasMultipleDifferentGlobalAssetIdsParam() throws IOException {
+		return BaSyxHttpTestUtils.executeGetOnURL(getURL()+"?assetIds=ew0KIm5hbWUiOiJnbG9iYWxBc3NldElkIiwNCiJ2YWx1ZSI6Imdsb2JhbEFzc2V0SWQiDQp9&assetIds=ew0KIm5hbWUiOiJnbG9iYWxBc3NldElkIiwNCiJ2YWx1ZSI6ImR1bW15QWFzQXNzZXRJZCINCn0");
+	}
+
+	protected CloseableHttpResponse getAllAasMultipleIdenticalGlobalAssetIdsParam() throws IOException {
+		return BaSyxHttpTestUtils.executeGetOnURL(getURL()+"?assetIds=ew0KIm5hbWUiOiJnbG9iYWxBc3NldElkIiwNCiJ2YWx1ZSI6Imdsb2JhbEFzc2V0SWQiDQp9&assetIds=ew0KIm5hbWUiOiJnbG9iYWxBc3NldElkIiwNCiJ2YWx1ZSI6Imdsb2JhbEFzc2V0SWQiDQp9");
+	}
+
 	protected CloseableHttpResponse getAllAasIdShortParam() throws IOException {
 		return BaSyxHttpTestUtils.executeGetOnURL(getURL()+"?idShort=ExampleMotor");
 	}
diff --git a/basyx.aasrepository/basyx.aasrepository-http/src/test/resources/EmptyResponse.json b/basyx.aasrepository/basyx.aasrepository-http/src/test/resources/EmptyResponse.json
new file mode 100644
index 000000000..309ebab7e
--- /dev/null
+++ b/basyx.aasrepository/basyx.aasrepository-http/src/test/resources/EmptyResponse.json
@@ -0,0 +1,5 @@
+{
+  "paging_metadata": {},
+  "result": [
+  ]
+}
\ No newline at end of file
diff --git a/basyx.aasservice/basyx.aasservice-backend-inmemory/src/main/java/org/eclipse/digitaltwin/basyx/aasservice/backend/InMemoryAasBackend.java b/basyx.aasservice/basyx.aasservice-backend-inmemory/src/main/java/org/eclipse/digitaltwin/basyx/aasservice/backend/InMemoryAasBackend.java
index 44297394a..3f88f07f3 100644
--- a/basyx.aasservice/basyx.aasservice-backend-inmemory/src/main/java/org/eclipse/digitaltwin/basyx/aasservice/backend/InMemoryAasBackend.java
+++ b/basyx.aasservice/basyx.aasservice-backend-inmemory/src/main/java/org/eclipse/digitaltwin/basyx/aasservice/backend/InMemoryAasBackend.java
@@ -35,6 +35,7 @@
 import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.stereotype.Component;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.TreeMap;
@@ -115,9 +116,9 @@ public AssetInformation getAssetInformation(String aasId) {
 	public Iterable<AssetAdministrationShell> getAllAas(List<SpecificAssetId> assetIds, String idShort) {
 		Iterable<AssetAdministrationShell> allAas = findAll();
 		List<AssetAdministrationShell> filteredAas = new java.util.ArrayList<>();
-		String globalAssetId = null;
+		List<SpecificAssetId> globalAssetIds = new ArrayList<>();
 		try {
-			globalAssetId = assetIds.stream().filter(assetId -> assetId.getName().equals("globalAssetId")).findFirst().get().getValue();
+			globalAssetIds = assetIds.stream().filter(assetId -> assetId.getName().equals("globalAssetId")).toList();
 			assetIds = assetIds.stream().filter(assetId -> !assetId.getName().equals("globalAssetId")).collect(Collectors.toList());
 		} catch (Exception e) {}
 		for (AssetAdministrationShell aas : allAas){
@@ -129,7 +130,15 @@ public Iterable<AssetAdministrationShell> getAllAas(List<SpecificAssetId> assetI
 				matchesAssetIds = false;
 			}
 			boolean matchesIdShort = (idShort == null || aas.getIdShort().equals(idShort));
-			boolean matchesGlobalAssetId = (globalAssetId == null || (aas.getAssetInformation() != null && aas.getAssetInformation().getGlobalAssetId() != null && aas.getAssetInformation().getGlobalAssetId().equals(globalAssetId)));
+			boolean matchesGlobalAssetId = globalAssetIds.isEmpty();
+			for (SpecificAssetId globalAssetId : globalAssetIds){
+				String id = globalAssetId.getValue();
+				if (aas.getAssetInformation() == null || aas.getAssetInformation().getGlobalAssetId() == null || !aas.getAssetInformation().getGlobalAssetId().equals(id)) {
+					matchesGlobalAssetId = false;
+					break;
+				}
+				matchesGlobalAssetId = true;
+			}
 			if (matchesAssetIds && matchesIdShort && matchesGlobalAssetId) {
 				filteredAas.add(aas);
 			}
diff --git a/basyx.aasservice/basyx.aasservice-backend-mongodb/src/main/java/org/eclipse/digitaltwin/basyx/aasservice/backend/MongoDBAasOperations.java b/basyx.aasservice/basyx.aasservice-backend-mongodb/src/main/java/org/eclipse/digitaltwin/basyx/aasservice/backend/MongoDBAasOperations.java
index 3fd254845..47b6ef440 100644
--- a/basyx.aasservice/basyx.aasservice-backend-mongodb/src/main/java/org/eclipse/digitaltwin/basyx/aasservice/backend/MongoDBAasOperations.java
+++ b/basyx.aasservice/basyx.aasservice-backend-mongodb/src/main/java/org/eclipse/digitaltwin/basyx/aasservice/backend/MongoDBAasOperations.java
@@ -240,13 +240,11 @@ private List<Criteria> buildAasFilterCriteria(List<SpecificAssetId> assetIds, St
         List<Criteria> criteriaList = new ArrayList<>();
 
         // Extract globalAssetId from assetIds
-        String globalAssetId = null;
+        List<SpecificAssetId> globalAssetIds = new ArrayList<>();
         try {
-            globalAssetId = assetIds.stream()
+            globalAssetIds = assetIds.stream()
                     .filter(assetId -> "globalAssetId".equals(assetId.getName()))
-                    .findFirst()
-                    .map(SpecificAssetId::getValue)
-                    .orElse(null);
+                    .toList();
 
             assetIds = assetIds.stream()
                     .filter(assetId -> !"globalAssetId".equals(assetId.getName()))
@@ -267,8 +265,8 @@ private List<Criteria> buildAasFilterCriteria(List<SpecificAssetId> assetIds, St
         }
 
         // Match globalAssetId if present
-        if (globalAssetId != null && !globalAssetId.isEmpty()) {
-            criteriaList.add(Criteria.where("assetInformation.globalAssetId").is(globalAssetId));
+        for (SpecificAssetId globalAssetId : globalAssetIds) {
+            criteriaList.add(Criteria.where("assetInformation.globalAssetId").is(globalAssetId.getValue()));
         }
 
         return criteriaList;