fixed customer id check for CustomerData

application/src/test/java/org/thingsboard/server/service/entitiy/EntityServiceTest.java

@@ -1116,6 +1116,29 @@ public class EntityServiceTest extends AbstractControllerTest {
         assertThat(deviceName).isEqualTo(devices.get(0).getName());
     }
 
+    @Test
+    public void testFindCustomerBySingleEntityFilter() {
+        SingleEntityFilter singleEntityFilter = new SingleEntityFilter();
+        singleEntityFilter.setSingleEntity(customerId);
+        List<EntityKey> entityFields = List.of(
+                new EntityKey(EntityKeyType.ENTITY_FIELD, "name")
+        );
+        EntityDataPageLink pageLink = new EntityDataPageLink(1000, 0, null, null);
+        EntityDataQuery query = new EntityDataQuery(singleEntityFilter, pageLink, entityFields, null, null);
+
+        //find by tenant
+        PageData<EntityData> result = findByQueryAndCheck(query, 1);
+        String customerName = result.getData().get(0).getLatest().get(EntityKeyType.ENTITY_FIELD).get("name").getValue();
+        assertThat(customerName).isEqualTo(TEST_CUSTOMER_NAME);
+
+        // find by customer user with generic permission
+        PageData<EntityData> customerResults = findByQueryAndCheck(customerId, query, 1);
+
+        customerName = customerResults.getData().get(0).getLatest().get(EntityKeyType.ENTITY_FIELD).get("name").getValue();
+        assertThat(customerName).isEqualTo(TEST_CUSTOMER_NAME);
+    }
+
+
     @Test
     public void testFindEntitiesByRelationEntityTypeFilter() {
         Customer customer = new Customer();

common/edqs/src/main/java/org/thingsboard/server/edqs/query/processor/AbstractQueryProcessor.java

@@ -65,7 +65,8 @@ public abstract class AbstractQueryProcessor<T extends EntityFilter> implements
 
     protected static boolean checkCustomerId(UUID customerId, EntityData<?> ed) {
         return customerId.equals(ed.getCustomerId()) || (ed.getEntityType() == EntityType.DASHBOARD &&
-                ed.getFields().getAssignedCustomerIds().contains(customerId));
+                ed.getFields().getAssignedCustomerIds().contains(customerId)
+                || (ed.getEntityType() == EntityType.CUSTOMER && customerId.equals(ed.getId())));
     }
 
     protected boolean matches(EntityData<?> ed) {