Solution : https://service.sap.com/sap/support/notes/682705 (SAP Service marketplace login required)
Key words : 
short text 'send bupa-rel-bdoc', iv_task type char1 default 'a', create function module bupa_mwxt_create_rel_bdoc_del, enter function module bupa_mwxt_create_main_bdoc_del, enter function module crm_bdt_da_send_bdoc, function module bupa_mwxt_create_main_bdoc_del, function module crm_bdt_da_send_bdoc, function group bupa_mwx_tools, importing parameter iv_task, type specification bu_partnerguid_t
Related Notes : 
       
| 675725 | Unnecessary BDocs in SRM (EBP) from queue CSA_MASS_BUPA | 
| 554460 | |
| 542312 |