Solution : https://service.sap.com/sap/support/notes/601721 (SAP Service marketplace login required)
Key words : 
smq1  683459 qrfc inbound scheduler performance improvements  636778 trfcqin index 7  640101 short dump sapsql_array_insert_duprec  644370 converting, smq2  683459 qrfc inbound scheduler performance improvements  742950 performance affected, v3 update calls disappear  616064 incorrect tid returned, smq2  584926 short dump qout_qin_mode_mismatch  593126 enhancement, trfc_set_qin_name_list  596884 short dump, qrfc_get_call_sequence  599984 upd-wps remain, identical  631562 qrfc remain, sm50  603413 duplicated execution, call rfcqueueinsert  613393 v2, current qrfc version
Related Notes : 
       
| 932975 | Oracle statistics for RFC tables | 
| 742950 | Performance affected on Oracle DB with Supplement 11 | 
| 683459 | qRFC performance improvements in the inbound scheduler | 
| 616064 | Incorrect TID returned by ID_OF_BACKGROUNDTASK | 
| 613393 | V2 and V3 update call disappear | 
| 596884 | Short dump when you use QRFC_GET_CALL_SEQUENCE | 
| 593126 | Enhancement of TRFC_SET_QIN_NAME_LIST | 
| 584926 | QOUT_QIN_MODE_MISMATCH short dump | 
| 574018 | Queue cannot be deleted in transaction SMQ2 |