Update stock item variant conversion form to use new function

InvenTree/stock/views.py

@@ -643,6 +643,16 @@ class StockItemConvert(AjaxUpdateView):
         form.fields['part'].queryset = item.part.get_conversion_options()
 
         return form
+    
+    def save(self, obj, form):
+
+        stock_item = self.get_object()
+
+        variant = form.cleaned_data.get('part', None)
+
+        stock_item.convert_to_variant(variant, user=self.request.user)
+
+        return stock_item
 
 
 class StockLocationCreate(AjaxCreateView):