The easiest way to do this is to write an order for yourself. There is a method how you can do this:
1. Go to PURCHASE & click on RECORDS.
2. Click on ORDER.
3. Click on create order button which is displayed above.
4. Add your supplier number in Lieferanten-Nr of Voucher Head and press Enter.
5. Fill all the necessary remaining fields like Delivery Address and Payment term.
6. Go to Positions and add your desired articles with the help of EAN.
7. You can find the correct purchase prices for the articles from the respective invoice for that order. That usually follow this format: "BMP-xxxxx".
After that you can book this order into your warehouse / stock as usual.