Solution : https://service.sap.com/sap/support/notes/536243 (SAP Service marketplace login required)
Key words :
system displays message cn688, dialog box requesting, valuation class found, system writes, -stock component, material master, material group, initially filled, account field, purchasing data
Related Notes :
| 541162 | IW31/IW32/IW34 - Dump CONVT_NO_NUMBER |
| 533262 | Message CN688 for contract |
| 516928 | G/L account determination for change to material group |
| 83916 | Not possible to determine a consumption account |