The existing function to associate invoices to sales orders is just crap. I have to make sure that sales order number of the sales order is equal to the order number of the invoice (which is then the order number of the customer's purchase order number). That doesn't make sense. After numerous attempts it still doesn't work and the function just refuses to associate the invoice with the sales order. This then leads to the case that the sales order is still open (but in reality all invoices are sent).
Why isn't there just a function to manually associate an invoice with a sales order?
Please just see the function with the eyes of a user! This is again one of the numerous cases where the implemented function are just not user-oriented!