Solution : https://service.sap.com/sap/support/notes/600907 (SAP Service marketplace login required)
Key words : 
0bimport parameter iv_methodreference type   coptional         xreference        ximport parameter iv_callerreference type   coptional         xreference        xexport parameter ev_callerreference type   creference        ' ', import parameter iv_methodreference type   char1optional         xreference        ximport parameter iv_callerreference type   char1optional         xreference        xexport parameter ev_callerreference type   char1reference        ' ', global parametersimport parameter iv_callerreference type   char1optional         xvalue transfer   ' 'short text       calling system / applicationexport parameter ev_callerreference type   char1pass, import parameter iv_methodreference type   char1optional         xpass, read global dataapplication         salesupper/lower case, xshort text       calling system / applicationsave, ' 'short text       access method, function group      caveshort text          set, activate function module cave_sl_doc_inbound_globpar, create function module cave_sl_doc_inbound_globpar
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