Solution : https://service.sap.com/sap/support/notes/1405731 (SAP Service marketplace login required)
Key words : 
-called client-side id, running inside netweaver portal, web dynpro java application, web dynpro page builder, web dynpro page, client/server roundtrip, find active instance, asynchronous input validation, application requesting focus, application scrolling field
Related Notes : 
       
| 1395865 | How-To Download Web Dynpro SCAs |