Solution : https://service.sap.com/sap/support/notes/122961 (SAP Service marketplace login required)
Key words :
system generates error message vl321 'item category xy, additional key words pstyv, item category determination, generated packing items, attached advance corrections, item category, usage 'pack' correctly, program error, item categories, usage pack
Related Notes :
| 80075 | Collective note on packing II Release 3.* |