IT FRESH-519

#197 Payment void or reverse correct

Testcase to check if payments can be voided and reversed without errors.

1. Create payments for G000X (incoming and outgoing payments, not yet allocated), or choose existing ones (already allocated)

2. Select a payment, and void it
   • => no NPE
   • => Doc Status becomes Rückgängig
   • => counter document is created, with same amount, negative
   • => description of each document includes the doc no. of the other one
   • => Reconciled is checked now
3. Select another payment, reverse correct it
   • => no NPE
   • => Doc Status becomes Rückgängig
   • => counter document is created, with same amount, negative
   • => description of each document includes the doc no. of the other one
   • => Reconciled is checked now
4. Search for a payment which is already used in a bank statement, try voiding / reversing it
   • => not possible, because of existing bank statement