diff --git a/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/transform/transforms/TransformConfig.java b/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/transform/transforms/TransformConfig.java
index fd9e6c64fade1..f13e72dcd22c5 100644
--- a/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/transform/transforms/TransformConfig.java
+++ b/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/transform/transforms/TransformConfig.java
@@ -387,13 +387,6 @@ ActionRequestValidationException validateNoCrossProjectWhenCrossProjectFeatureIs
                     validationException
                 );
             }
-            // verify there is no project routing
-            if (getSource().getProjectRouting() != null) {
-                validationException = addValidationError(
-                    "Cross-project calls are not supported, but project_routing was requested: " + getSource().getProjectRouting(),
-                    validationException
-                );
-            }
         }
         return validationException;
     }
diff --git a/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/transform/transforms/TransformConfigTests.java b/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/transform/transforms/TransformConfigTests.java
index 28dcca4e3927a..1523e18f51476 100644
--- a/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/transform/transforms/TransformConfigTests.java
+++ b/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/transform/transforms/TransformConfigTests.java
@@ -1139,10 +1139,6 @@ public void testCrossProjectWithFeatureDisabled() throws IOException {
             validationException.getMessage(),
             containsString("Cross-project calls are not supported, but remote indices were requested: [project-1:src]")
         );
-        assertThat(
-            validationException.getMessage(),
-            containsString("Cross-project calls are not supported, but project_routing was requested: _alias:_origin")
-        );
     }
 
     public void testNotCrossProjectEnvironment() throws IOException {
diff --git a/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportValidateTransformAction.java b/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportValidateTransformAction.java
index 7a4fb8239c88b..9ca1c7ff68dbe 100644
--- a/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportValidateTransformAction.java
+++ b/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportValidateTransformAction.java
@@ -33,7 +33,6 @@
 import org.elasticsearch.xpack.core.transform.action.ValidateTransformAction;
 import org.elasticsearch.xpack.core.transform.action.ValidateTransformAction.Request;
 import org.elasticsearch.xpack.core.transform.action.ValidateTransformAction.Response;
-import org.elasticsearch.xpack.core.transform.transforms.TransformConfig;
 import org.elasticsearch.xpack.transform.TransformServices;
 import org.elasticsearch.xpack.transform.transforms.FunctionFactory;
 import org.elasticsearch.xpack.transform.transforms.TransformNodes;
@@ -152,8 +151,7 @@ protected void doExecute(Task task, Request request, ActionListener<Response> li
 
         // <3> Validate Project Routing is not set when CPS is not supported
         ActionListener<Boolean> validateProjectRoutingListener = validateConfigListener.delegateFailureAndWrap((l, ignored) -> {
-            if (config.getSource().getProjectRouting() == null
-                || (crossProjectModeDecider.crossProjectEnabled() && TransformConfig.TRANSFORM_CROSS_PROJECT.isEnabled())) {
+            if (config.getSource().getProjectRouting() == null || crossProjectModeDecider.crossProjectEnabled()) {
                 l.onResponse(true);
             } else {
                 l.onFailure(