Solution : https://service.sap.com/sap/support/notes/426953 (SAP Service marketplace login required)
Key words : 
function group ci20in development class imrm, function group xi20in development class imrm, additional key words task list, imrm                        enter function module exit_saplci20_001, component processing  development class, sy-batch  reference type, general maintenance task list, customer exit exit_saplci20_001 import, create customer exit ci200001, technical location task lists
Related Notes : 
       
| 526975 | Task list components 4.6A and 4.6B | 
| 413373 | Task list components 46 C (Part 2) | 
| 407413 | Task list components in Release 3.1I | 
| 403701 | New component processing (deactivation) | 
| 401893 | New component processing (Activation) | 
| 398783 | Task list components in Release 4.6C |