If the status of an invoice is: Invoice ... “is being printed” or “in processing”, this invoice is in the printer buffer and is currently being processed there.
If the message when printing the invoice is: The document 'Invoice number' is currently being processed by another process.
If the status does not change within a short time (< 1minute), please proceed as follows:
1. copy the invoice number
2. mark the line in the print spooler
3. delete the marked line(s) with Ctrl + D
4. save
5. open the invoice (invoice number from cache)
6. print the invoice another time
-> if invoice is locked by a user, the lock must be unlocked first. see article:
If an error message appears indicating that the invoice has already been printed, check in the invoice journal and send it again by email using the reprint function