Solution : https://service.sap.com/sap/support/notes/710121 (SAP Service marketplace login required)
Key words :
posting multipart/form-data, preview list, http 400 error, 400 bad request, post reason, solution upgrade, sap note 709606, prerequisites
Related Notes :
| 709606 | Http POST request fails with 400 bad request |
| 588913 | Central note for Import and Export for EP 6.0 |