Solution : https://service.sap.com/sap/support/notes/317710 (SAP Service marketplace login required)
Key words :
additional key words iw31, add field tfkbt-fkbtx, input field caufvd-func_area, display field element list, solution transaction se51, fields caufvd-func_area, modification group 4 generate, pm/sm order, functional area field, screen saplcoih 1130 layout
Related Notes :
921112 | The functional area field is only 4 characters long |
420382 | Functional area cannot be changed in the PM/CS order |
85799 | Collective note: Cost of sales accounting problems |