Solution : https://service.sap.com/sap/support/notes/699395 (SAP Service marketplace login required)
Key words : 
symptom knowledgebase synchronization tab appears, knowledgebase synchronization reason, knowledge basesynchronization tab, 1 sp04     note 606415 solution, kbase sync tab, kbase sync, terms kbase, running conntrans, conntrans application, standard installation     3
Related Notes : 
       
| 610336 | CRM Mobile Client Component: Installation/Upgrade 4.0 SP01 | 
| 606415 | Enabling Knowledgebase Synchronization in Conntrans | 
| 585086 | CRM Mobile Client Component: Upgrade to 3.0SP14 / 3.1SP04 | 
| 583719 |