[2329] Fix the membership used when importing (as text) a requirement inside a requirement

CHANGELOG.adoc

@@ -35,6 +35,7 @@ It has long been unused by Sirius Web itself (since the transition to MUI).
 - https://github.com/eclipse-syson/syson/issues/2194[#2194] [diagrams] Properly report feedback messages to user when using _ISysMLMoveElementService_.
 - https://github.com/eclipse-syson/syson/issues/2306[#2306] [diagrams] Fixed an error when trying to rename a constraint displayed as a list item through direct edit.
 - https://github.com/eclipse-syson/syson/issues/2318[#2318] [diagrams] Direct edit on a constraint label now ignores the expression part (`{ ... }`) if present in the new text.
+- https://github.com/eclipse-syson/syson/issues/2329[#2329] [import] Fix invalid relation created when importing a requirement inside a requirement.
 
 === Improvements
 

backend/application/syson-sysml-import/src/main/java/org/eclipse/syson/sysml/ASTTransformer.java

@@ -192,7 +192,7 @@ private Runnable addInParent(Element parent, Element child) {
         if (child instanceof Import imp) {
             parent.getOwnedRelationship().add(imp);
             undo = () -> parent.getOwnedRelationship().remove(imp);
-        } else if (child instanceof Expression expr) {
+        } else if (child instanceof Expression expr && !(child instanceof Usage)) {
             var compatibleOwnerships = this.metamodelQueryElementService.getCompatibleExpressionOwnerships(parent);
             if (!compatibleOwnerships.isEmpty()) {
                 var selectedOwnership = compatibleOwnerships.get(0);