Add Compoships for multile key relationships, first implemented with Service::class

app/Models/InvoiceItem.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use Awobaz\Compoships\Compoships;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Arr;
@@ -20,7 +21,7 @@ use App\Traits\PushNew;
  */
 class InvoiceItem extends Model
 {
-	use PushNew;
+	use Compoships,PushNew;
 
 	protected $dates = [
 		'start_at',