Solution : https://service.sap.com/sap/support/notes/1454655 (SAP Service marketplace login required)
Key words : 
rfcserver initialization - increase max table fields join-engine - ensures deletion, - lowered cpu consumption query-optimizer - fix, partition attribute index-server - index-server, error handling reorg-landscape - fix, sortallresults olap-engine - fix, backup mode mutual - fix, 5 alert-server - fixed issue, increasing alertserver memory consumption, existing trex/bwa instance, revision rfc-server - fixes
Related Notes : 
       
| 1492990 | BWA 7.00/7.20: TrexAlertServerCheckFullDetails trace | 
| 1458131 | BWA 7.00 Rev54: AlertServer corrections and hints | 
| 883726 | BIA 7.00: Central Note SAP NetWeaver BI accelerator |