Solution : https://service.sap.com/sap/support/notes/885918 (SAP Service marketplace login required)
Key words : 
sapbwnews bw support package 15 netweaver'04 stack 15, additional i_contsyschecks import parameter, 'special content system check', 10 content            import support package 23, rssm_shipdvers_cleanup function module create, 0b            import support package 29, rssm_shipdvers_cleanup function module, content-creating system, creating content reason, incorrect source system &
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