diff --git a/config-model/src/main/java/com/yahoo/schema/processing/FieldSetSettings.java b/config-model/src/main/java/com/yahoo/schema/processing/FieldSetSettings.java
index 66fe36a9af16..f194a60a9e2f 100644
--- a/config-model/src/main/java/com/yahoo/schema/processing/FieldSetSettings.java
+++ b/config-model/src/main/java/com/yahoo/schema/processing/FieldSetSettings.java
@@ -2,6 +2,7 @@
 package com.yahoo.schema.processing;
 
 import com.yahoo.config.application.api.DeployLogger;
+import com.yahoo.document.TensorDataType;
 import com.yahoo.schema.RankProfileRegistry;
 import com.yahoo.schema.Schema;
 import com.yahoo.schema.document.FieldSet;
@@ -11,6 +12,9 @@
 import com.yahoo.schema.document.Stemming;
 import com.yahoo.vespa.model.container.search.QueryProfiles;
 
+import java.util.LinkedList;
+import java.util.logging.Level;
+
 /**
  * Computes the right "index commands" for each fieldset in a search definition.
  *
@@ -22,6 +26,8 @@
 // (this requires adding normalizing and stemming settings to FieldSet).
 public class FieldSetSettings extends Processor {
 
+    private static String fieldSetDocUrl = "https://docs.vespa.ai/en/reference/schema-reference.html#fieldset";
+
     public FieldSetSettings(Schema schema,
                             DeployLogger deployLogger,
                             RankProfileRegistry rankProfileRegistry,
@@ -37,6 +43,7 @@ public void process(boolean validate, boolean documentsOnly) {
             checkMatching(schema, fieldSet);
             checkNormalization(schema, fieldSet);
             checkStemming(schema, fieldSet);
+            checkTypes(schema, fieldSet);
         }
     }
 
@@ -104,4 +111,23 @@ private void checkStemming(Schema schema, FieldSet fieldSet) {
         }
     }
 
+    private void checkTypes(Schema schema, FieldSet fieldSet) {
+        var tensorFields = new LinkedList<String>();
+        var nonTensorFields = new LinkedList<String>();
+        for (String fieldName : fieldSet.getFieldNames()) {
+            ImmutableSDField field = schema.getField(fieldName);
+            if (field.getDataType() instanceof TensorDataType) {
+                tensorFields.add(field.getName());
+            } else {
+                nonTensorFields.add(field.getName());
+            }
+        }
+        if (!tensorFields.isEmpty() && !nonTensorFields.isEmpty()) {
+            var fullMsg = "For schema '" + schema.getName() + "', fieldset '" + fieldSet.getName() + "': " +
+                    "Tensor fields ['" + String.join("', '", tensorFields) + "'] " +
+                    "cannot be mixed with non-tensor fields ['" + String.join("', '", nonTensorFields) + "'] " +
+                    "in the same fieldset. See " + fieldSetDocUrl;
+            deployLogger.logApplicationPackage(Level.WARNING, fullMsg);
+        }
+    }
 }
diff --git a/config-model/src/test/java/com/yahoo/schema/processing/FieldSetSettingsTestCase.java b/config-model/src/test/java/com/yahoo/schema/processing/FieldSetSettingsTestCase.java
new file mode 100644
index 000000000000..57155f3062ec
--- /dev/null
+++ b/config-model/src/test/java/com/yahoo/schema/processing/FieldSetSettingsTestCase.java
@@ -0,0 +1,83 @@
+// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.schema.processing;
+
+import com.yahoo.config.model.application.provider.BaseDeployLogger;
+import com.yahoo.schema.derived.TestableDeployLogger;
+import org.junit.jupiter.api.Test;
+
+import static com.yahoo.schema.ApplicationBuilder.createFromStrings;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+public class FieldSetSettingsTestCase {
+
+    @Test
+    public void legalFieldTypeMix() {
+        assertDoesNotThrow(() -> createFromStrings(new BaseDeployLogger(), childSd("fieldset default { fields: ci,pi }"), parentSd()));
+        assertDoesNotThrow(() -> createFromStrings(new BaseDeployLogger(), childSd("fieldset default { fields: ct,pt }"), parentSd()));
+    }
+
+    @Test
+    public void warnableFieldTypeMix() {
+        var logger = new TestableDeployLogger();
+        assertDoesNotThrow(() -> createFromStrings(logger, childSd("fieldset default { fields: ci,ps }"), parentSd()));
+        assertArrayEquals(new String[]{
+                "For schema 'child', field 'ps': " +
+                        "The matching settings for the fields in fieldset 'default' are inconsistent (explicitly or because of field type). " +
+                        "This may lead to recall and ranking issues.",
+                "For schema 'child', field 'ps': " +
+                        "The normalization settings for the fields in fieldset 'default' are inconsistent (explicitly or because of field type). " +
+                        "This may lead to recall and ranking issues."}, logger.warnings.toArray());
+    }
+
+    @Test
+    public void illegalFieldTypeMix() {
+        var logger = new TestableDeployLogger();
+        assertDoesNotThrow(() -> createFromStrings(logger, childSd( "fieldset default { fields: ci, pt }"), parentSd()));
+        assertArrayEquals(new String[]{"For schema 'child', fieldset 'default': Tensor fields ['pt'] cannot be mixed with non-tensor fields ['ci'] in the same fieldset. " +
+                "See https://docs.vespa.ai/en/reference/schema-reference.html#fieldset"}, logger.warnings.toArray());
+    }
+
+
+    private static String childSd(String fieldSet) {
+        return """
+                  schema child {
+                    document child {
+                      field ci type int {
+                        indexing: attribute
+                      }
+                      field cs type string {
+                        indexing: attribute
+                      }
+                      field ct type tensor(x[2]) {
+                        indexing: attribute
+                      }
+                      field parent_ref type reference<parent> {
+                        indexing: attribute
+                       }
+                    }
+                    import field parent_ref.pi as pi { }
+                    import field parent_ref.ps as ps { }
+                    import field parent_ref.pt as pt { }
+                  """ + fieldSet + """
+                  }
+                """;
+    }
+    private static String parentSd() {
+        return """
+                schema parent {
+                  document parent {
+                    field pi type int {
+                      indexing: attribute
+                    }
+                    field ps type string {
+                      indexing: attribute
+                    }
+                    field pt type tensor(x[2]) {
+                      indexing: attribute
+                    }
+                  }
+                }
+                """;
+    }
+}