Regarding your Proforma Invoice AP-001856. The value not according with the value in P/O of customer. Because customer do not buy Proximity switch and they do not told us then they issue P/O.
He took a net price minus the price Proximity switch causes the value does not match with your invoice, that 11 CHF different. The edit customer order take a long time. Please correct the invoice in accordance with the customer's purchase order, which is a little different.