Solution : https://service.sap.com/sap/support/notes/76876 (SAP Service marketplace login required)
Key words :
system generates error message c1801, additional key words udef, valuation dialog box, prerequisites solution repair, problems occur, user-defined, language-specific, source code, valuating characteristic, characteristic
Related Notes :
| 91440 | Rel.3.1I: F1-help for UDEF characteristics |