Solution : https://service.sap.com/sap/support/notes/766373 (SAP Service marketplace login required)
Key words : 
user defined layout, standard default layout, standard layout, hassome fields, launchingthe transaction, terms locator, subroutine fill_ldb_req_fields, program error, solution apply, lcrm_1o_locatorf07
Related Notes : 
       
| 774631 | Locator:fields not filled upon selecting a layout | 
| 740776 | Locator: Fields are not populated for default layout | 
| 650686 |