Solution : https://service.sap.com/sap/support/notes/13525 (SAP Service marketplace login required)
Summary :
To conduct thorough error analysis related to printing issues, a detailed spool work process log is necessary. In the process overview (transaction SM50), the trace level can be modified by choosing the process and navigating through Process -> Trace -> Select Active Components. In the dialog box, select "Print" (deselect "Taskhandler") and set "Tracelevel" to 2. Before reproducing the problem, reset traces via Process -> Trace -> Reset, and afterwards, reset the trace to default. Support Packages and correction instructions modify Report RSPO0050, which sets trace levels system-wide. For Release 4.6C, create RFC function module TH_REMOTE_SET_WP_TRACE in group SDEB.
Key words :
create rfc function module th_remote_set_wp_trace, process -> trace -> select active components, note modify report rspo0050, function group sdeb, spool work process, process -> trace -> reset, terms error analysis, sap support requests, correction instructions listed, process overview