BR-27 error
BR-27 means an invoice line's item net price is negative — it must be zero or positive.
What this rule checks
Explanation
An invoice line's item net price (BT-146) must not be negative. This rule fires when a line's unit price is a negative number — a discount or reduction belongs in the invoice line's allowance/charge fields, not as a negative unit price.
How to fix it
Set the item net price to zero or a positive value. If you're representing a discount, use an invoice line allowance (a dedicated negative-adjustment field) instead of a negative price.
Check your corrected invoice
Free, no sign-up, file never stored.