IT gh#791

#791 Create Nachbelastung from Invoice Cast exception

Testcase to check if Nachbelastung works fine without throwing exceptions

1. Create 2 sales invoices for G000X (manually or from order and inout):
   • P0001, 5 TU A, for 10.00 each; P0002, 10 TU B, for 5.50 each, set a reference
   • P0002, 11 TU B, for 5.50 each; P0001, 7 TU A, for 10.00 each, set a reference and a description
2. In the 1st invoice, click Nachbelastung:
   • => no error popping up
   • => small window opens, where you can select the type: Nachbelastung Mengendifferenz, Nachbelastung Preisdifferenz
3. Select Nachbelastung Mengendifferenz, OK
   • => new invoice window opens, doc type: Nachbelastung Mengendifferenz
   • => reference: same as 1st invoice
   • => all lines from original 1st invoice are included
   • => description: Nachbelastung for invoice: no. of 1st invoice, order reference: reference of 1st invoice, original invoice text: empty

4. Delete one of the invoice lines, and change the qty of TUs in the other invoice line; save & complete

5. Print the jasper:
   • => Nachbelastung, all info from the invoice displayed correctly (plus inout if you created one)
6. Check your original 1st invoice:
   • => the button for Nachbelastung is not displayed anymore, only for credit memo
7. In the 2nd invoice, click Nachbelastung:
   • => no error popping up
   • => small window opens, where you can select the type: Nachbelastung Mengendifferenz, Nachbelastung Preisdifferenz
8. Select Nachbelastung Preisdifferenz, OK
   • => new invoice window opens, doc type: Nachbelastung Preisdifferenz
   • => reference: same as 2nd invoice
   • => all lines from original 2nd invoice are included
   • => description: Nachbelastung for invoice: no. of 2nd invoice, order reference: reference of 2nd invoice, original invoice text: text from description in 2nd invoice

9. Delete one of the invoice lines, and change the price in the other invoice line; save & complete

10. Print the jasper:
    • => Nachbelastung, all info from the invoice displayed correctly (plus inout if you created one)
11. Check your original 2nd invoice:
    • => the button for Nachbelastung is not displayed anymore, only for credit memo
12. If you like, you can reverse / delete one of your Nachbelastungen again, and check the original invoice once more:
    • => a new invoice is created, as coutnerpart for the reversed / deleted Nachbelastung, with neg. qties
    • => both Nachbelastungen are marked as paid, and have an allocation for the reversal / delete in tab Zuordnung
    • => the Nachbelastung button is displayed again in the original invoie´ce, you can create a new Nachbelastung