By default, Ulyses Suite allows you to issue invoices when the total is '0'. However, it is possible to configure the invoice type to limit this functionality and not allow closing invoices if the taxable base is 0. In that case, a message like this will appear:
What can I do if the above message appears?
The most common reason for the above message to appear is that a deposit (with tax) has been applied to a folio for the total amount of charges and, therefore, the taxable base is 0:
In this case, if no other services need to be charged, you should open a new folio and transfer the deposit or charges so that the positive amount is on one side and the negative on the other:
Finally, to avoid cash discrepancies, both folios should be closed with the same payment method: