diff --git a/src/main/java/fr/adrienbrault/idea/symfony2plugin/completion/PhpIncompleteCompletionContributor.java b/src/main/java/fr/adrienbrault/idea/symfony2plugin/completion/PhpIncompleteCompletionContributor.java
index f13374aca..3b1588065 100644
--- a/src/main/java/fr/adrienbrault/idea/symfony2plugin/completion/PhpIncompleteCompletionContributor.java
+++ b/src/main/java/fr/adrienbrault/idea/symfony2plugin/completion/PhpIncompleteCompletionContributor.java
@@ -20,6 +20,7 @@
 import fr.adrienbrault.idea.symfony2plugin.form.FormUnderscoreMethodReference;
 import fr.adrienbrault.idea.symfony2plugin.form.util.FormOptionsUtil;
 import fr.adrienbrault.idea.symfony2plugin.form.util.FormUtil;
+import fr.adrienbrault.idea.symfony2plugin.templating.variable.resolver.FormFieldResolver;
 import fr.adrienbrault.idea.symfony2plugin.util.PhpElementsUtil;
 import kotlin.Pair;
 import org.apache.commons.lang3.StringUtils;
@@ -60,9 +61,24 @@ protected void addCompletions(@NotNull CompletionParameters completionParameters
                                 return;
                             }
 
+                            Set<String> alreadyKnownFields = new HashSet<>();
+                            String formTypeClassFromScope = FormUtil.getFormTypeClassFromScope(parent);
+                            if (formTypeClassFromScope != null) {
+                                PhpClass clazz = PhpElementsUtil.getClassInterface(project, formTypeClassFromScope);
+                                if (clazz != null) {
+                                    FormFieldResolver.visitFormReferencesFields(clazz, twigTypeContainer -> alreadyKnownFields.add(twigTypeContainer.getStringElement()));
+                                }
+                            }
+
                             FormUnderscoreMethodReference.visitPropertyPath(
                                 phpClass,
-                                pair -> completionResultSet.addElement(new MyLookupElement(pair.getFirst(), "add", pair.getSecond(), phpClass.getName()))
+                                pair -> completionResultSet.addElement(new MyLookupElement(
+                                    pair.getFirst(),
+                                    "add",
+                                    pair.getSecond(),
+                                    phpClass.getName(),
+                                    alreadyKnownFields.contains(pair.getFirst())
+                                ))
                             );
                         }
                     }
@@ -140,19 +156,28 @@ private class MyLookupElement extends com.intellij.codeInsight.lookup.LookupElem
 
         private final PhpNamedElement phpNamedElement;
         private final String typeText;
+        private final @NotNull boolean exists;
 
-        public MyLookupElement(@NotNull String key, @NotNull String lookupElement, @NotNull PhpNamedElement phpNamedElement, @NotNull String typeText) {
+        public MyLookupElement(@NotNull String key, @NotNull String lookupElement, @NotNull PhpNamedElement phpNamedElement, @NotNull String typeText, boolean exists) {
             this.key = key;
             this.lookupElement = lookupElement;
             this.phpNamedElement = phpNamedElement;
             this.typeText = typeText;
+            this.exists = exists;
         }
 
         @Override
         public void renderElement(@NotNull LookupElementPresentation presentation) {
             super.renderElement(presentation);
+
+            if (this.exists) {
+                presentation.setTypeText(typeText, Symfony2Icons.SYMFONY_AI_OPACITY);
+                presentation.setTypeGrayed(true);
+            } else {
+                presentation.setTypeText(typeText, Symfony2Icons.SYMFONY_AI);
+            }
+
             presentation.setIcon(phpNamedElement.getIcon());
-            presentation.setTypeText(typeText, Symfony2Icons.SYMFONY);
             presentation.setTypeIconRightAligned(true);
         }
 
diff --git a/src/main/java/fr/adrienbrault/idea/symfony2plugin/form/util/FormUtil.java b/src/main/java/fr/adrienbrault/idea/symfony2plugin/form/util/FormUtil.java
index d1187d8bf..67444a558 100644
--- a/src/main/java/fr/adrienbrault/idea/symfony2plugin/form/util/FormUtil.java
+++ b/src/main/java/fr/adrienbrault/idea/symfony2plugin/form/util/FormUtil.java
@@ -760,7 +760,21 @@ public static Collection<String> getFormTypeParentFromFormTypeImplementation(@No
     }
 
     public static Pair<String, Map<String, String>> getGuessedFormFieldParameters(@NotNull PhpIndex phpIndex, @NotNull Project project, @NotNull String key, @NotNull PhpNamedElement phpNamedElement) {
-        PhpType phpType = phpIndex.completeType(project, phpNamedElement.getType(), new HashSet<>());
+        // method / function
+        PhpType phpType = null;
+        if (phpNamedElement instanceof Function function) {
+            PsiElement parameter = function.getParameter(0);
+            if (parameter instanceof PhpTypedElement phpTypedElement) {
+                phpType = phpIndex.completeType(project, phpTypedElement.getType(), new HashSet<>());
+            }
+        } else {
+            // properties
+            phpType = phpIndex.completeType(project, phpNamedElement.getType(), new HashSet<>());
+        }
+
+        if (phpType == null) {
+            return new Pair<>("\\Symfony\\Component\\Form\\Extension\\Core\\Type\\TextType", null);
+        }
 
         String typeClass = null;
         Map<String, String> options = new HashMap<>();
diff --git a/src/main/java/fr/adrienbrault/idea/symfony2plugin/templating/variable/resolver/FormFieldResolver.java b/src/main/java/fr/adrienbrault/idea/symfony2plugin/templating/variable/resolver/FormFieldResolver.java
index aa9c6a004..9b18c1f5a 100644
--- a/src/main/java/fr/adrienbrault/idea/symfony2plugin/templating/variable/resolver/FormFieldResolver.java
+++ b/src/main/java/fr/adrienbrault/idea/symfony2plugin/templating/variable/resolver/FormFieldResolver.java
@@ -188,7 +188,7 @@ public static void visitFormReferencesFields(@NotNull PsiElement formReference,
     }
 
     /**
-     * Field all form fields in given PhpClass which should already be just a form type
+     * Visit all form fields in given PhpClass which are already a form type
      */
     public static void visitFormReferencesFields(@NotNull PhpClass phpClass, @NotNull Consumer<TwigTypeContainer> consumer) {
         visitFormReferencesFields(phpClass.getProject(), Collections.singleton(phpClass), consumer);