The suppliers and customers information are in the Invoice creation from purchase order, or in Blank invoice automatically pre-entered. By need can be majority of the cells also manually edited.
Supplier information:
In order for the supplier's information to get entered in the system automatically, you have the option of updating the information in the Master data of your company. In addition you can here enter your Sales tax ID once, so you don't have to do it repeatedly. For editing this information you have the option to do so in the tab "Supplier information".
Customer Information:
Whereas the customer's information is automatically transfered from an order, the Sales tax ID is transfered from your company's Master data, as long as this information was recorded beforehand.
By clicking on the green Plus sign opens other data entry fields. To colapse these back, click on "Delete".