What you may be experiencing:
Customers are encountering an error or no confirmation after Selling Items from a Customer Order.
- Cannot execute the Command: Invalid State.
- The Data you are trying to modify is already in use by this workstation.
What you can try now:
Try right-clicking on the Windows Task Bar and choose Cascade Windows to bring the payment modal window back into focus and complete the transaction.
We are aware of this issue and appreciate your patience as we continue to research root cause and possible solutions.