Solution : https://service.sap.com/sap/support/notes/884889 (SAP Service marketplace login required)
Key words : 
prerequisites field supplier vendor, purchase orders created, executing action ord1, terms vehicle manager, symptom delivery address, plant address, passing data, vlc_ord1_execute, bapi_po_create1, corrections
Related Notes : 
       
| 855514 | Current Release Restrictions for DBM 500 for Ramp Up |