Solution : https://service.sap.com/sap/support/notes/737798 (SAP Service marketplace login required)
Key words :
patch level 12 post parameters, terms sap gui, post parameters, post reason, parameters transferred, starting application, portal environment, transferred, ~disconnectonclose, ~flickerfree
Related Notes :
| 731578 | ITS: Parameters in URL with ~disconnectonclose=1 |
| 687948 | SAP GUI for HTML/IAC: URL parameter and ~disconnectonclose |