I just carried out this step and allocated freight to a random 'couriers and freight' account I have, and it now works for new bills only. Old bills that I try to duplicate don't save still (the majority of my bills are reoccuring so very annoying to not be able to duplicate rent/phone bills etc) -
If clearing the cache and cookies hasn't resolved the issue for you can you go to Accounting>>Manage linked accounts>>Purchases>>tick I pay freight on purchases and select an account. Then try creating a new Bill.
Can you please provide a fix for when I'm wanting to duplicate a bill?
Thanks,
Alex