Validate customer data in the Customer list /visma-net-erp/help/customer-ledger/customer-classes/validate-customer-data-in-the-customer-list section 2026-02-19T17:09:06+01:00 # Validate customer data in the Customer list You can make settings in the [Countries/counties/postcodes (CS20400S)](/visma-net-erp/help/common-settings/common-settings-windows/countries-counties-postcodes-cs20400s/) and [Customer classes (AR201000)](/visma-net-erp/help/customer-ledger/customer-ledger-windows/customer-classes-ar201000/) windows, so that the system validates the data that comes in via AutoInvoice to the [Customer list (AR40101S)](/visma-net-erp/help/customer-ledger/customer-ledger-windows/customer-list-ar40101s/). Fields that are missing information will be marked with ![icon-error-exclamation](/media/visma-net-erp/icon-error-exclamation.png). 1. Go to the [Customer list (AR40101S)](/visma-net-erp/help/customer-ledger/customer-ledger-windows/customer-list-ar40101s/) window. 1. Select a **Customer class**. 1. Select a **Country**. 1. Select the correct check box for **AutoInvoice validation**. 1. The system validates the list of customers and the ![icon-error-exclamation](/media/visma-net-erp/icon-error-exclamation.png) is displayed where information is missing for customers that have the option **Send to AutoInvoice** set. > [!NOTE] > You can select a customer in the table and click **View customer** to go to the [Customers (AR303000)](/visma-net-erp/help/customer-ledger/customer-ledger-windows/customers-ar303000/) window and look at the details for a specific customer.

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