Hi,
Is there any specific reason why you are using RA order type ? RA Repair order is specific to create a Service Order with reference to repair item.
you can create a User status in OIBS and assign this to RA order type. In this you can configure the user status as IN RETURN STO. This status can be set automatically in the Repair order once you do GI, just try with configuration in OIBS transaction code.
Normally you cannot invoice RA directly with FR billing document as RA is enabled with Expense account which will have the cost posted from the Service Order. It is evident from the screenshot that the item categories IRRE and IRAL populated are standard and without service order you cannot from the If you want to Billing RA then you should try to create Billing document only with IRRA item category which will be first item in your Repair order.
In standard the above mentioned item categories are not enabled in copy control from RA to FR, Try to enable them in copy control and create billing, If you find difficulty after assigning copy control, please revert
thanks
santosh