Solution : https://service.sap.com/sap/support/notes/190694 (SAP Service marketplace login required)
Key words :
system generates message ru428, additional key words cancellation, field selection 'lists, check posting date, field selection, posting date, posting period & &, posting period, transaction cn29, activity element
Related Notes :
| 158712 | |
| 135422 | Cancellation not possble since postng period locked |
| 79954 |