Larave UpdateOR Create not work with relationship

I want to update my related table on laravel 5.4

my code

    $id=$request->id;

    $find=Presal::find($id);
    $find->user_id=$request->customer_id;
    $find->proposalid=$request->proposalid;
    $psal=$find->save();

    if($psal)
    {
        foreach( $request->service_item_id as $key => $n ) {
            $find->proposalService()->updateOrCreate([
                'service_item_id' => $request->service_item_id[$key],
                'start_date' => $request->start_date[$key],
                'end_date' => $request->end_date[$key],
                'service_type_id' => $request->service_type_id[$key],
                'vendor_submit' => $request->vendor_submit[$key]
            ]);

        }
   }

Here always my code create a new row in proposalService but not update. How can I make create if new and Update if exist.

via Chebli Mohamed