I don't know if anyone encountered this problem at all, I am new to prestashop and I've been trying to figure this out unsuccessfully ^^'. Can anyone please help :).
I tried directly to assign the value of $return_allowed to 1 so that I force the display of the checkboxes and overall (RMA display) when in the order-detail. My order status is on delivered.
But when I click on the button to create an RMA, I get this :
So I am kind of lost right now..