diff --git a/core/src/main/java/com/cosium/hal_mock_mvc/Form.java b/core/src/main/java/com/cosium/hal_mock_mvc/Form.java
index 59d60f8..487077f 100644
--- a/core/src/main/java/com/cosium/hal_mock_mvc/Form.java
+++ b/core/src/main/java/com/cosium/hal_mock_mvc/Form.java
@@ -197,6 +197,9 @@ private ValidatedFormProperty<?> validate(
       FormProperty<?> property, PropertyValidationOption... validationOptions) throws Exception {
     Set<PropertyValidationOption> validationOptionSet =
         Optional.ofNullable(validationOptions).map(Set::of).orElse(Set.of());
+    if (validationOptionSet.contains(PropertyValidationOption.Immediate.DO_NOT_FAIL_IF_NOT_VALID)) {
+      return ValidatedFormProperty.markAsValid(property);
+    }
     TemplatePropertyRepresentation representation =
         template.representation().propertyByName().get(property.name());
     if (representation == null) {
diff --git a/core/src/main/java/com/cosium/hal_mock_mvc/PropertyValidationOption.java b/core/src/main/java/com/cosium/hal_mock_mvc/PropertyValidationOption.java
index bc6341a..15f8d58 100644
--- a/core/src/main/java/com/cosium/hal_mock_mvc/PropertyValidationOption.java
+++ b/core/src/main/java/com/cosium/hal_mock_mvc/PropertyValidationOption.java
@@ -9,6 +9,8 @@ enum Immediate implements PropertyValidationOption {
     /** Do not fail if writing to a property not declared by the template */
     DO_NOT_FAIL_IF_NOT_DECLARED,
     /** Do not fail if writing to a property declared as read-only by the template */
-    DO_NOT_FAIL_IF_DECLARED_READ_ONLY
+    DO_NOT_FAIL_IF_DECLARED_READ_ONLY,
+    /** Do not fail if writing invalid value to a property */
+    DO_NOT_FAIL_IF_NOT_VALID,
   }
 }
diff --git a/core/src/test/java/com/cosium/hal_mock_mvc/FormTest.java b/core/src/test/java/com/cosium/hal_mock_mvc/FormTest.java
index bfcc825..58674d2 100644
--- a/core/src/test/java/com/cosium/hal_mock_mvc/FormTest.java
+++ b/core/src/test/java/com/cosium/hal_mock_mvc/FormTest.java
@@ -7,6 +7,7 @@
 import static org.springframework.hateoas.server.mvc.WebMvcLinkBuilder.methodOn;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
+import com.cosium.hal_mock_mvc.PropertyValidationOption.Immediate;
 import com.fasterxml.jackson.jr.ob.JSON;
 import com.jayway.jsonpath.DocumentContext;
 import com.jayway.jsonpath.JsonPath;
@@ -1843,6 +1844,40 @@ void test39() throws Exception {
         .doesNotThrowAnyException();
   }
 
+  @Test
+  @DisplayName("User can force an invalid property")
+  void test40() throws Exception {
+    myController.getResponseToSend =
+        JSON.std
+            .composeString()
+            .startObject()
+            .startObjectField("_links")
+            .startObjectField("self")
+            .put("href", "http://localhost/form-test:put")
+            .end()
+            .end()
+            .startObjectField("_templates")
+            .startObjectField("default")
+            .put("method", "PUT")
+            .startArrayField("properties")
+            .end()
+            .end()
+            .end()
+            .end()
+            .finish();
+
+    Form form =
+        HalMockMvc.builder(mockMvc)
+            .baseUri(linkTo(methodOn(MyController.class).get()).toUri())
+            .build()
+            .follow()
+            .templates()
+            .byKey("default")
+            .createForm();
+    assertThatCode(() -> form.withString("foo", "foo", Immediate.DO_NOT_FAIL_IF_NOT_VALID))
+        .doesNotThrowAnyException();
+  }
+
   @Controller
   public static class MyController {