Solution : https://service.sap.com/sap/support/notes/556420 (SAP Service marketplace login required)
Key words :
path settings -> options -> planning board -> table area -> display network, activated indicator 'display network' defines, /3 support package statuses sapkh46b47, project planning board, attached program correction, network number, table area, activity element number, program error, activity number
Related Notes :
| 553927 | CJ2B: ineffective field control in table section |
| 494969 | CJ2B:activity number change in the table section |
| 412078 | Project planning board: Various problems with sorting |