Solution : https://service.sap.com/sap/support/notes/364966 (SAP Service marketplace login required)
Key words :
enter 'import parameters' erkrs = s001 choose 'execute', rke_generate_interface_act choose 'single test', terms incoming sales order, enter 'function module', incoming sales order, function module rke_generate_interface_act, reversal line items, double reversal reason, actual data update, attached program corrections
Related Notes :
| 524946 | Incoming SO: Scheduling agreements and confirmed quantities |
| 512776 | KE4T: Subseqntly posting scheduling agreements not possible |
| 144016 | Incom. sales order for sched. agreements incorrect |