Constraints for Front-End Printing 
The following constraints apply to front-end printing, due to the special way in which it works:
· You cannot perform front-end printing in the background, as there is not connection to the front end.
· Since release 4.5A, you can print from the update process to the front end. To do this, the user must still be logged on when the print request is sent in the update process.
However, we recommend that you do not use front-end printing from the update process, as it is not possible to check whether multiple update work processes are attempting to perform front-end printing simultaneously. Front-end printing does not work for more than one work process.
· A free session is required for front-end printing, so it must not be the case that all sessions are occupied.
However, front-end print requests are not lost if all sessions are occupied, but are temporarily stored in the database. The printing is performed once there are sufficient sessions available on the user terminal again. The print requests are output on the current terminal even if the user is now working from a different terminal.
You can subsequently print the print requests in transaction SP01 by choosing Restart Frontend Printing in online operation without requiring an additional session.
· Front-end printing should not be used for production or mass printing.
For more information about constraints for front-end printing, see SAP Note 114426 in the SAP Service Marketplace.
See also:
Front-End Printing on Local Printers
