---
title: "About input masks"
description: "Input masks may be created to help users enter data in the required format."
lang: en
languages:
  en: https://docs.vismasoftware.no/visma-net-erp/help/common-settings/about-input-masks/index.md
lastmod: 2026-02-19
---

> Documentation index: https://docs.vismasoftware.no/visma-net-erp/help/common-settings/llms.txt


# About input masks

Last modified February 19, 2026

> Input masks may be created to help users enter data in the required format.


Input masks may be created to help users enter data in the required format.
Masks are used,
for example, for phone numbers, postcodes, and VAT registrations.

Moreover, regular expressions can be created to validate the entered values, because the values for some elements must meet not only input format requirements but also specific rules.

For more details on the format of masks, see: [About input validation options](https://docs.vismasoftware.no/visma-net-erp/help/common-settings/about-input-validation-options/index.md).

## Postcodes

Input masks for postcodes are set in the [Countries/counties/postcodes (CS20400S)](https://docs.vismasoftware.no/visma-net-erp/help/common-settings/common-settings-windows/countries-counties-postcodes-cs20400s/index.md) window.
They are used for input validation in the
following windows:

+ [Branches (CS102000)](https://docs.vismasoftware.no/visma-net-erp/help/organisation-structure/organisation-structure-windows/branches-cs102000/index.md)
+ [Suppliers (AP303000)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/suppliers-ap303000/index.md)
+ [Customers (AR303000)](https://docs.vismasoftware.no/visma-net-erp/help/customer-ledger/customer-ledger-windows/customers-ar303000/index.md)

## VAT registrations

Input masks for tax registrations are set in the [Countries/counties/postcodes (CS20400S)](https://docs.vismasoftware.no/visma-net-erp/help/common-settings/common-settings-windows/countries-counties-postcodes-cs20400s/index.md) window.
They
are used for input validation in the following windows:

+ [VAT (TX205000)](https://docs.vismasoftware.no/visma-net-erp/help/vat/vat-windows/vat-tx205000/index.md)
+ [VAT categories (TX205500)](https://docs.vismasoftware.no/visma-net-erp/help/vat/vat-windows/vat-categories-tx205500/index.md)
+ [VAT zones (TX206000)](https://docs.vismasoftware.no/visma-net-erp/help/vat/vat-windows/vat-zones-tx206000/index.md)
+ [Buildings (CS205010)](https://docs.vismasoftware.no/visma-net-erp/help/organisation-structure/organisation-structure-windows/buildings-cs205010/index.md)
+ [Suppliers (AP303000)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/suppliers-ap303000/index.md)
+ [Supplier locations (AP303010)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/supplier-locations-ap303010/index.md)
+ [Customers (AR303000)](https://docs.vismasoftware.no/visma-net-erp/help/customer-ledger/customer-ledger-windows/customers-ar303000/index.md)


---

[View this page](https://docs.vismasoftware.no/visma-net-erp/help/common-settings/about-input-masks/)