Solution : https://service.sap.com/sap/support/notes/513177 (SAP Service marketplace login required)
Key words :
wbs element default rule, 'assignments' tab page, tab pages 'scheduling', attached program corrections, wbs element, distribution rule, wbs elementhowever, program error, transaction cn21, standard network
Related Notes :
| 516900 | CN21: NOT_FOUND after Note 513177 |
| 484067 | Create network,template standard network:release immediately |