Product class optimisation

app/Models/Product/Phone.php

@@ -42,17 +42,8 @@ final class Phone extends Type implements ProductItem
 	// The model that is referenced when this product is ordered
 	protected string $order_model = ServicePhone::class;
 
-	/* RELATIONS */
-
-	/**
-	 * The offering supplied with this product
-	 *
-	 * @return \Illuminate\Database\Eloquent\Relations\HasOne
-	 */
-	public function supplied()
-	{
-		return $this->hasOne(SupplierPhone::class,'id','supplier_item_id');
-	}
+	// The model that the supplier supplies
+	const SupplierModel = SupplierPhone::class;
 
 	/* INTERFACES */