Order related invoice blocked for accounting

Hello everyone,

I'm having trouble with a scenario of fixed assets sales that I need to invoice as a non-stock non-value item through an order related billing (without delivery). I have configured the item category with billing relevance B, but when I attempt to release the billing to accounting it triggers the message "Document XXXXX saved (no accounting document generated)". I see that VFX3 says delivery-related billing type, so I'm guessing it has something to do with that. There is no problem in VKOA, account is determined correctly. The item category has "Sched. line Allowed" set otherwise the order will grey out the quantity field and therefore the net value will be set to zero. "Item relevant for delivery" is not checked. Any thoughts? Thanks!