diff --git a/agrest-cayenne/src/test/java/io/agrest/cayenne/GET/ExpIT.java b/agrest-cayenne/src/test/java/io/agrest/cayenne/GET/ExpIT.java
index 5a385452c..b855f1420 100644
--- a/agrest-cayenne/src/test/java/io/agrest/cayenne/GET/ExpIT.java
+++ b/agrest-cayenne/src/test/java/io/agrest/cayenne/GET/ExpIT.java
@@ -16,6 +16,7 @@
 import jakarta.ws.rs.core.Configuration;
 import jakarta.ws.rs.core.Context;
 import jakarta.ws.rs.core.UriInfo;
+
 import java.time.LocalDateTime;
 
 public class ExpIT extends MainDbTest {
@@ -379,6 +380,30 @@ public void like_SingleChar_Pattern_Escape() {
                 .wasOk().bodyEquals(1, "{\"id\":4}");
     }
 
+    @Test
+    public void exists_Path_Relationship() {
+
+        tester.e2().insertColumns("id_", "name")
+                .values(1, "qwe")
+                .values(2, "try")
+                .exec();
+
+        tester.e3().insertColumns("id_", "name", "e2_id")
+                .values(1, "xxx", 1)
+                .values(2, "yxy", 2)
+                .values(3, "y_y", 2)
+                .values(4, "y_ay", null)
+                .exec();
+
+        tester.target("/e3")
+                .queryParam("include", "id")
+                .queryParam("exp", "exists e2")
+                .queryParam("sort", "id")
+                .get()
+                .wasOk()
+                .bodyEquals(3, "{\"id\":1}", "{\"id\":2}", "{\"id\":3}");
+    }
+
     @Test
     public void like_MultiChar_Pattern_Escape() {
 
diff --git a/agrest-cayenne/src/test/java/io/agrest/cayenne/processor/CayenneQueryAssemblerTest.java b/agrest-cayenne/src/test/java/io/agrest/cayenne/processor/CayenneQueryAssemblerTest.java
index 7b10f9480..65584fb23 100644
--- a/agrest-cayenne/src/test/java/io/agrest/cayenne/processor/CayenneQueryAssemblerTest.java
+++ b/agrest-cayenne/src/test/java/io/agrest/cayenne/processor/CayenneQueryAssemblerTest.java
@@ -15,6 +15,7 @@
 import io.agrest.runtime.processor.select.SelectContext;
 import org.apache.cayenne.di.Injector;
 import org.apache.cayenne.exp.Expression;
+import org.apache.cayenne.exp.ExpressionException;
 import org.apache.cayenne.exp.ExpressionFactory;
 import org.apache.cayenne.query.ObjectSelect;
 import org.junit.jupiter.api.Test;
@@ -129,6 +130,23 @@ public void createRootQuery_Qualifier_Exists() {
         assertEquals(expectedQ1.andExp(ExpressionFactory.notExists(ObjectSelect.query(E3.class).column(E3.E5))), q2.getWhere());
     }
 
+    @Test
+    public void createRootQuery_Qualifier_Exists_Invalid_Condition() {
+        RootResourceEntity<E3> entity = getResourceEntity(E3.class);
+
+        SelectContext<E3> c = new SelectContext<>(
+                E3.class,
+                new RequestSchema(mock(AgSchema.class)),
+                mock(AgRequestBuilder.class),
+                PathChecker.ofDefault(),
+                mock(Injector.class));
+
+        c.setEntity(entity);
+
+        entity.andExp(Exp.exists("name = 'test1'"));
+        assertThrows(ExpressionException.class, () -> queryAssembler.createRootQuery(c));
+    }
+
     @Test
     public void createRootQuery_ById() {
 
diff --git a/agrest-engine/src/test/java/io/agrest/exp/parser/ExpExistsTest.java b/agrest-engine/src/test/java/io/agrest/exp/parser/ExpExistsTest.java
index d88120f0d..bc453023a 100644
--- a/agrest-engine/src/test/java/io/agrest/exp/parser/ExpExistsTest.java
+++ b/agrest-engine/src/test/java/io/agrest/exp/parser/ExpExistsTest.java
@@ -28,7 +28,7 @@ public void parsedToString(String expString, String expected) {
     }
 
     @ParameterizedTest
-    @ValueSource(strings = {"exists", "exists()"})
+    @ValueSource(strings = {"exists", "exists()", "exists (name == 'test')"})
     public void parseInvalidGrammar(String expString) {
         assertThrows(AgException.class, () -> Exp.parse(expString));
     }
diff --git a/agrest-engine/src/test/java/io/agrest/exp/parser/ExpNotExistsTest.java b/agrest-engine/src/test/java/io/agrest/exp/parser/ExpNotExistsTest.java
index 86e26c117..77eedc56d 100644
--- a/agrest-engine/src/test/java/io/agrest/exp/parser/ExpNotExistsTest.java
+++ b/agrest-engine/src/test/java/io/agrest/exp/parser/ExpNotExistsTest.java
@@ -31,7 +31,7 @@ public void parsedToString(String expString, String expected) {
     }
 
     @ParameterizedTest
-    @ValueSource(strings = {"not exists", "not exists()"})
+    @ValueSource(strings = {"not exists", "not exists()", "not exists (name == 'test')"})
     public void parseInvalidGrammar(String expString) {
         assertThrows(AgException.class, () -> Exp.parse(expString));
     }