Question:
How do I update an invoice that has been accepted from Arms-length (AL) to non-arms-length (NAL)?
Answer:
Although the distro type will remain AL type on the invoice, it will function as an NAL distributor:
For each line item of the invoice
Turn off "Auto Calculate Excise"
Set "Excise Tax Per Unit" to 0
Deactivate the AL distributors and only use NAL distributors moving forward.