Problem
You clicked Add in the Add VAT rate dialog, but see a red error notification instead of a confirmation.
Possible cause
The error notification usually explains the reason directly. Common causes are: missing required fields, a duplicate combination of percentage and account number, or a temporary network error.
Solution
Read the error message carefully — it usually tells you what is wrong.
Check that all three required fields (VAT name, VAT (%), and VAT account number) are filled in correctly.
Check that the combination of percentage and account number does not already exist in the list.
If it is a network error, try again. If the error persists, reload the page and try again.
If the problem persists, contact support and include details about:
The exact error message you see.
What you entered in the fields.
When the issue occurred.