I have this function:

In Order.php:

public function isReadyForPackingSlip(): bool
{
   // some code
}

And in twig:

{% if order.isReadyForPackingSlip %}

I get this error:

Neither the property "isReadyForPackingSlip" nor one of the methods "isReadyForPackingSlip()", "getisReadyForPackingSlip()"/"isisReadyForPackingSlip()"/"hasisReadyForPackingSlip()" or "__call()" exist and have public access in class "AppEntityPlatformOrderOrder".

I dont want to change the funciton name… how can I work around this?

The twig shouldnt throw error when calling this function.