IT FRESH-732

#448 Rounding issue with partical credit memos

Testcase to check if the rounding is done correctly in partial credit memos.

1. Create a sales order for G000X, for a huge qty of P0001, so that the overall amt to pay will be >10.000 CHF / EUR

2. Make sure you’re using a pricing system that includes taxes!

3. Create the inout, and the invoice

4. Open Zahlung, and create a partial payment for the invoice:
   • select your invoice
   • set the amt to pay (Zahlungsbetrag) to 0,01 CHF / EUR (or another very small amt you prefer)
   • check over-underpayment, so that Abschreibungsbetrag becomes 0,00
   • if there is a Skonto amt set (from payment conditions, e.g.) you can leave it in or take it out

5. Save and complete

6. Go back to your invoice, check tab allocation:
   • => payment with 0,01 is displayed
7. In the 1st tab, press Credit Memo (Gutschrift) to create a credit memo:
   • select the normal type of Credit Memo
   • you can leave the boxes for references of sales order and invoice
8. Check the credit memo, and the amt that was credited:
   • => reference for your invoice
   • => amt: invoice amt - 0,01 OR invoice amt - 0,01 - Skonto amt
9. Check your invoice again:
   • => paid checkbox is checked
   • => tab allocations: credit memo is displayed as well
10. Try with other types of credit memo too; also, create orders / invoices that include different taxes
    • => should work the same