Solution : https://service.sap.com/sap/support/notes/143602 (SAP Service marketplace login required)
Key words :
function modules sd_salesdocument_create, additional key words, attached advance corrections, bapi check list, attached source code, customer data entered, table vbep1st field, table vbakfield, table vbapfield, customer enhancements
Related Notes :
| 183889 | No processing of customer fields for CHANGE BAPI |
| 143580 | Information on SD BAPIs and customer enhancement concept |