Check if you can navigate back to "Finanzübersicht" with the button "zurück". Check if all the TextFields are filled in by default. "Ausführungsdatum" should be filled in with a date that is 19 days from now. You should still be able to edit all test fields. Check if the input restrictions for the payment amount is working correctly.
Check if the table is shown correcty.
Check if the filters and sorting by name is working.
Check if you can uncheck and check the CheckBoxes.
Check if the button "alle abwählen" is working correctly.
Check if the "SEPA-XML ERSTELLEN" button is working correctly. It should open a dialog that changes dependent on which radio button is selected.