Are you selecting the clients? If so, try including one client that actually has time. You don't have to approve that client bill. In some versions of Timeslips you could not run a "close out" bill if that is the only client you are running bills for. The other thing is to make sure the invoices for these clients are not in proof or revision. If none of that works, just go ahead and change the classification. The message is a warning, not a stopper. It's best practice to close out, but not an absolute.
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