### Setting Up VAT Validation Rules

Parallels Business Automation - Standard provides a tool for VAT number format validation. This is a preliminary validation that is not related to the Anti-Fraud Manager.

The VAT validation is not very strict and allows filtering an absolutely incorrect VAT numbers.

Preliminary VAT validation is applied at the moment when a customer saves an account data

In case a VAT number does not pass a preliminary validation, it will be not allowed to save an account data with such a VAT number.

The default set of VAT validation rules is a number of regular expressions that define the correct VAT format for most of European countries.

The list of VAT validation rules displays the following:

- Country. The country a VAT validation rule corresponds to.
- Rule. The regular expression that defines the correct VAT format for a given country.
- Modified. This column shows whether a default rule (i.e., a regular expression) have been changed or not:
  - - A default rule have been changed. You can always restore default.
  - - A default rule is stored in its default format, nothing have been changed.

The buttons above the list of Rules serve for:

- Add Rule - add a new country and VAT validation rule for this country.
- Reset to Default - reset ALL modified rules to default values. Attention: to reset to default a particular modified rule, click on the country name and as a rule details appear on the screen, click the Reset to Default button.

To add a rule:

1. Click the Add Rule button.
2. Fill the form:
   1. Country. Select the country from the drop-down menu.
   2. Validation rule. Enter the regular expression that defines VAT format for this country and will to be used for VAT number validation for customers that specify this country in their accounts.
3. Click the Update button.

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