Solution : https://service.sap.com/sap/support/notes/740776 (SAP Service marketplace login required)
Key words : 
user command sy-ucomm '&load', user defined layout, worklist tab bothif, search tab, populates thefields, terms locator, on_todo_after_user_command reason, solution apply, notpopulate, cl_crm_1o_locator
Related Notes : 
       
| 774631 | Locator:fields not filled upon selecting a layout | 
| 766373 | Locator:Fields not filled for user defined default layout | 
| 747299 | EBP/CRM 3.0 SP Stack 06/2004 (SAPKU30019): Release&Info.Note |