Solution : https://service.sap.com/sap/support/notes/689816 (SAP Service marketplace login required)
Key words :
field actual work filled, field afru-kapid, prerequisites missing knowledge, field afru-split, cats-user exit, original confirmation data, confirmation user-exits, individual overview capacities, capacity category filled, actual work displayed
Related Notes :
105183 | Forecast work in operation apparently incorrect |