Solution : https://service.sap.com/sap/support/notes/119634 (SAP Service marketplace login required)
Key words : 
task list explosion, field 'work center', additional key words, attached advance corrections, transaction cu50, access data, plpod-arbpl, prerequisites
Related Notes : 
       
| 120315 | CU50:Object list task list-PRT material, doc., equi |