Solution : https://service.sap.com/sap/support/notes/1084349 (SAP Service marketplace login required)
Key words :
symptom duet travel management workflow pattern customization, choose tools -> customizing -> business configuration sets -> activation, 'create object directory entry' dialog box, 'activation options' dialog box, user languages' check box, menu utilities->user settings, 'upload bc set' button, bc set '/osp/trvl_wfp_combined', 'continue activation' button, 'select activation mode'
Related Notes :
| 1067168 | Duet 1.5 SP00: Release Information Note |