Solution : https://service.sap.com/sap/support/notes/192256 (SAP Service marketplace login required)
Key words :
system generates warning message ke496, additional key words fb01, characteristic target field occurs, relevant operating concern, display standard steps, master data table, -pa assignment screen, edit > step attributes, saving characteristics values, user-defined characteristics
Related Notes :
130576 | Manual assgnmnt of dependent characteristics: error |
122578 | CO-PA realignment: characteristics are not changed |