Solution : https://service.sap.com/sap/support/notes/509681 (SAP Service marketplace login required)
Key words :
entire front-end print process, error message 'maximum number, update task work process, update task work process', update task work processes, terms front-end print, front-end output requests, update work processes, front-end printer, sessions reached' appears
Related Notes :
| 509338 | Profile parameter rspo/local_print/server does not work |