Solution : https://service.sap.com/sap/support/notes/1610804 (SAP Service marketplace login required)
Key words :
Related Notes :
| 1451336 | Preventing entries for date for first posting at cond. level |
| 1408070 | 'First Posting From' and deleted conditions |
| 1384936 | Date of first posting cannot be changed |
| 1070082 | Changing Date of Cash Flow From & Date of First Posting |
| 939974 | FAQ: Contract, contract offer, conditions, cash flow |