Solution : https://service.sap.com/sap/support/notes/460647 (SAP Service marketplace login required)
Key words :
duplicate distribution rule, attached program correction, header-assigned subnetwork, settlement rule, program error, structure planning, project builder, milestone function, assignment exists, wbs element
Related Notes :
426524 | Duplicate settlemt rule when creating partial network in PPT |
365988 | No settlement rule created for subnetwork |