Solution : https://service.sap.com/sap/support/notes/891459 (SAP Service marketplace login required)
Key words : 
interface determination occurs, sap_appl package atab, dealer business management, control tables tamlaya, control table tamlayb, correct user interfaces, ui /dbm/order, create group boxes '2050', relevant group box, central order transaction
Related Notes : 
       
| 855514 | Current Release Restrictions for DBM 500 for Ramp Up |