AX Custom security role on transfer order issue

I created a role for creating transfer orders. I want the users assigned this role to be able to delete transfer order items and at the same time he cannot delete the transfer order itself , so i granted him a create permission on the INVENTTRANSFERORDER menu item. and delete permission on the RETAILADDITEMS menu item. however it doesn't work as expected I can create orders and add items to it but cannot delete items from the Transfer order. is there a way to solve this?