Reduction of amount for siblings implemented

app/Domains/Event/Actions/SetParticipationFees/SetParticipationFeesCommand.php

@@ -12,6 +12,9 @@ class SetParticipationFeesCommand {
 
     public function execute() : SetParticipationFeesResponse {
         $response = new SetParticipationFeesResponse();
+        $this->request->event->sibling_reduction = $this->request->siblingReduction;
+        $this->request->event->save();
+
         $this->cleanBefore();
 
         $this->request->event->participationFee1()->associate(EventParticipationFee::create([