Just to verify – I started working with a client recently, whereby their Invoice Open Batches are getting close to 9999.
(Not sure if they have ever run a Year-End in Invoices in the past.)

My guess is that they will be unable to continue once this happens, and that what we have to do is run the Year-End before they reach 9999, even if it may not yet be their fiscal year end.

Is this correct?