You can only submit positive batches. There will be an error message if you try to submit a batch with a negative balance.
Due to your property migration to our new payment system ( EPass), some of the bookings that you have already charged, are still issued under Epass (that could be a system delay for example).
Due to system limitations, these transactions cannot be removed, but instead, you were assigned an adjustment with the same but negative amount.
So these bookings will be chargeable again, and they are displayed under current transaction \ remittances.
After you have cleared this negative balance, you will be able to charge further bookings as per usual.
Current transactions screen - Booking transactions list:
Current transactions screen - Summary transactions list: