Solution : https://service.sap.com/sap/support/notes/214146 (SAP Service marketplace login required)
Key words : 
additional key words ekpo-ebonf, create vendor data, price determination schema, field 'subsequent settlement', subsequent settlement, plant level, lfm2-bolre, purchasing item, set incorrectly, solution implement
Related Notes : 
       
| 206060 | Ind. 'Subseq. settlement', deviating vendor data | 
| 169882 | ME22: Take alternative vendor data into account | 
| 40147 | Collective note: Subsequent settlement (Purch.) Release 3.0 |