use this.sipDataAttribute instead of magic constant.

javascript/src/QfqRecordList.js

@@ -35,7 +35,7 @@ if (!QfqNS) {
             throw new Error($recordElement.length + ' match(es) found for record class');
         }
 
-        var sip = $eventTarget.data('sip');
+        var sip = $eventTarget.data(this.sipDataAttribute);
 
         if (!sip) {
             throw new Error('No `sip` on delete button');