[2360] Fix an issue on widget ref creation modal

Bug: #2360
Signed-off-by: Florian ROUËNÉ <florian.rouene@obeosoft.com>

CHANGELOG.adoc

@@ -68,6 +68,7 @@ Note that _palette_ will be removed in short-term from the _DiagramDescription_.
 An error message is now displayed if the _Shape_ is not set.
 - https://github.com/eclipse-sirius/sirius-web/issues/2309[#2309] [diagram] Fix an issue where the edge labels where not always centered on react-flow diagrams
 - https://github.com/eclipse-sirius/sirius-web/issues/2195[#2195] [view] Fix an issue where a border color set to _None_ would set the color to a default color, not none.
+- https://github.com/eclipse-sirius/sirius-web/issues/2360[#2360] [form] Fix an issue that prevent creation of new object on some containment reference with the reference widget.
 
 === New Features
 

packages/forms/backend/sirius-components-collaborative-widget-reference/src/main/java/org/eclipse/sirius/components/collaborative/widget/reference/datafetchers/ReferenceWidgetReferenceDataFetcher.java

@@ -42,7 +42,7 @@ public ReferenceWidgetReferenceDataFetcher(IEMFKindService emfKindService) {
     public Reference get(DataFetchingEnvironment environment) throws Exception {
         ReferenceWidget referenceWidget = environment.getSource();
         var feature = referenceWidget.getSetting().getEStructuralFeature();
-        return new Reference(this.emfKindService.getKind(feature.getEContainingClass()),
+        return new Reference(this.emfKindService.getKind(referenceWidget.getSetting().getEObject().eClass()),
                 feature.getName(),
                 this.emfKindService.getKind(((EReference) feature).getEReferenceType()),
                 ((EReference) feature).isContainment(),