Solution : https://service.sap.com/sap/support/notes/161720 (SAP Service marketplace login required)
Key words :
additional key words choose header info, function 'settings -> choose header info', planning type information, planning type, planning object, planning table, access display, aggregated level, material description, material number
Related Notes :
| 74168 | Material short text in header => user exit |
| 67614 | How to use the function 'Choose header info' |
| 60506 | Example of functional enhancement for header information |