diff --git a/Px.Utils.UnitTests/Validation/ContentValidationTests/ContentValidationTests.cs b/Px.Utils.UnitTests/Validation/ContentValidationTests/ContentValidationTests.cs
index 94640ad..8711d52 100644
--- a/Px.Utils.UnitTests/Validation/ContentValidationTests/ContentValidationTests.cs
+++ b/Px.Utils.UnitTests/Validation/ContentValidationTests/ContentValidationTests.cs
@@ -187,6 +187,27 @@ public void ValidateFindStubOrHeadingCalledWithWithMissingHeadingReturnsWithErro
             Assert.AreEqual(ValidationFeedbackRule.MissingStubAndHeading, result.First().Key.Rule);
         }
 
+        [TestMethod]
+        public void ValidateFindStubOrHeadingCalledWithDuplicateDimensionsReturnsWithWarning()
+        {
+            // Arrange
+            ValidationStructuredEntry[] entries = ContentValidationFixtures.STRUCTURED_ENTRY_ARRAY_WITH_DUPLICATE_DIMENSION;
+            ContentValidator validator = new(filename, encoding, entries);
+            SetValidatorField(validator, "_defaultLanguage", defaultLanguage);
+            SetValidatorField(validator, "_availableLanguages", availableLanguages);
+
+            // Act
+            ValidationFeedback? result = ContentValidator.ValidateFindStubAndHeading(
+                entries,
+                validator
+                );
+
+            // Assert
+            Assert.IsNotNull(result);
+            Assert.AreEqual(1, result.Count);
+            Assert.AreEqual(ValidationFeedbackRule.DuplicateDimension, result.First().Key.Rule);
+        }
+
         [TestMethod]
         public void ValidateFindRecommendedKeysCalledWithMissingDescriptionsReturnsWithWarnings()
         {
diff --git a/Px.Utils.UnitTests/Validation/Fixtures/ContentValidationFixtures.cs b/Px.Utils.UnitTests/Validation/Fixtures/ContentValidationFixtures.cs
index 20e5e32..47eca8b 100644
--- a/Px.Utils.UnitTests/Validation/Fixtures/ContentValidationFixtures.cs
+++ b/Px.Utils.UnitTests/Validation/Fixtures/ContentValidationFixtures.cs
@@ -159,6 +159,15 @@ internal static class ContentValidationFixtures
                 5,
                 Utils.Validation.ValueType.ListOfStrings);
 
+        private static readonly ValidationStructuredEntry headingEntryWithBar =
+            new(filename,
+                new ValidationStructuredEntryKey("HEADING"),
+                "\"bar-time\",\"bar\"",
+                10,
+                [],
+                5,
+                Utils.Validation.ValueType.ListOfStrings);
+
         private static readonly ValidationStructuredEntry headingEnEntry =
             new(filename,
                 new ValidationStructuredEntryKey("HEADING", "en"),
@@ -485,6 +494,14 @@ internal static class ContentValidationFixtures
                 stubEntry,
             ];
 
+        internal static ValidationStructuredEntry[] STRUCTURED_ENTRY_ARRAY_WITH_DUPLICATE_DIMENSION =>
+            [
+                stubEntry,
+                stubEnEntry,
+                headingEntryWithBar,
+                headingEnEntry
+            ];
+
         internal static ValidationStructuredEntry[] STRUCTURED_ENTRY_ARRAY_WITH_MULTIPLE_DIMENSION_NAMES =>
             [
                 multipleStubNamesEntry,
diff --git a/Px.Utils/Validation/ContentValidation/ContentValidator.ValidationFunctions.cs b/Px.Utils/Validation/ContentValidation/ContentValidator.ValidationFunctions.cs
index ac2e1d5..3ab7e6a 100644
--- a/Px.Utils/Validation/ContentValidation/ContentValidator.ValidationFunctions.cs
+++ b/Px.Utils/Validation/ContentValidation/ContentValidator.ValidationFunctions.cs
@@ -296,6 +296,25 @@ public sealed partial class ContentValidator
                             $"{language}")
                     );
 
+                    feedbackItems.Add(feedback);
+                }
+                // Check if any of the heading names are also in the stub names
+                else if (validator._stubDimensionNames is not null &&
+                    validator._headingDimensionNames is not null &&
+                    validator._stubDimensionNames.TryGetValue(language, out string[]? stubValue) &&
+                    validator._headingDimensionNames.TryGetValue(language, out string[]? headingValue) &&
+                    stubValue.Intersect(headingValue).Any())
+                {
+                    string[] duplicates = stubValue.Intersect(headingValue).ToArray();
+                    KeyValuePair<ValidationFeedbackKey, ValidationFeedbackValue> feedback = new(
+                        new(ValidationFeedbackLevel.Warning,
+                        ValidationFeedbackRule.DuplicateDimension),
+                        new(validator._filename,
+                        0,
+                        0,
+                        $"{language}, {string.Join(", ", duplicates)}")
+                    );
+
                     feedbackItems.Add(feedback);
                 }
             }
diff --git a/Px.Utils/Validation/Enums.cs b/Px.Utils/Validation/Enums.cs
index 58873ba..05e1b8d 100644
--- a/Px.Utils/Validation/Enums.cs
+++ b/Px.Utils/Validation/Enums.cs
@@ -84,6 +84,7 @@ public enum ValidationFeedbackRule
         AliasFileMissing = 54,
         DuplicateFileNames = 55,
         StartOfDataSectionNotFound = 56,
-        DuplicateEntry = 57
+        DuplicateEntry = 57,
+        DuplicateDimension = 58
     }
 }