Solution : https://service.sap.com/sap/support/notes/1614802 (SAP Service marketplace login required)
Key words :
DDFTX, DD_INT_UPDATE_DDFTX, DD_VIEW_INNER_ACT, DD30V, SELMTYPE
Related Notes :
| 1702617 | Timeout or deadlock on table DDFTX when generating screens |
| 1155807 | Database deadlock when executing DD_INT_UPDATE_DDFTX |
| 745639 | FAQ: Oracle enqueues |