Prevent delete record if screen is not deletable

Closes #13885

sao/src/tab.js

@@ -957,7 +957,8 @@
             });
         },
         delete_: function() {
-            if (!Sao.common.MODELACCESS.get(this.screen.model_name)['delete']) {
+            if (!Sao.common.MODELACCESS.get(this.screen.model_name)['delete']
+                || !this.screen.deletable) {
                 return jQuery.when();
             }
             var msg;