VAT codes are defined in RCS to mirror the codes available in Oracle Accounts Receivables (AR), so that the code can be passed to Oracle with each invoice instruction.
This screen defines the unique Code list, Names for each, the applicable VAT rate, and the Display order (for use elsewhere in the system).
The VAT rate is only used in SLM if VAT needs to be applied to a licence fee, and that fee is being paid in advance e.g. for a new Customer paying pay for their first licence by credit/debit card via Worldpay.
In all other cases where AR invoices for a licence fee the VAT component is calculated and applied in the AR system.