"'%1' already exists." Why do you receive this message and what can you do to resolve it?

Peppol is an international standard for digital business. This open infrastructure is compatible with the MKG ERP software, allowing you to send, receive, and process electronic invoices, orders, and other business data via a secure connection. This article explains the benefits of Peppol and how the Peppol integration works in our software.

The second step in the period closure is updating all manual entries. Think of manual purchase and sales invoices, bank statements, cash transactions, and periodic items such as accrued assets and payroll journal entries.

Within the purchasing and sales process, additional costs can be used. Think of transportation costs or certification costs. In this article, you will learn how to configure additional costs and what to consider when adding additional costs to purchase and sales invoices.

Manual sales invoices are invoices that are sent entirely outside of the process. Examples can be found in the sale of (depreciated) company assets and the lending or renting of company assets that are not recorded in a sales order. However, you must still record the revenue.

You sell your products not only in the Netherlands but also abroad. The difference lies in whether you are dealing with an EU country or a non-EU country. This mainly affects the administrative handling of VAT. In this article, you will learn how to book an EU sales invoice.

Once you have delivered the products to the customer, you can invoice the sales order. The invoice can be created from the sales order line via the 'Sales Orders' module or from the Invoice List. In this article, you will learn how to create a sales invoice via the Invoice List.

Reversing means undoing a booking in MKG. Incorrectly or unjustly created delivery notes and invoices can be corrected in this way. Reversing has no effect on the result. In this article, you will read how to reverse a sales invoice.

Crediting means giving a 'discount' on a previously created invoice, for example, because a product arrived damaged to the customer. Crediting affects the result. In this article, you will learn how to create a credit invoice.

Once you have delivered the products and the price has been approved, you can invoice the sales order. This article explains how to invoice a sales order from the sales order line.