Solution : https://service.sap.com/sap/support/notes/762432 (SAP Service marketplace login required)
Key words : 
ipc product master cache, ipc server log files, 0 support package 04 - support package 07, sap software center, 0 support package 07, 0 support package 08, logged server, crm server, exception occurs, concurrentmodificationexceptionat java
Related Notes : 
       
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