Solution : https://service.sap.com/sap/support/notes/608863 (SAP Service marketplace login required)
Key words :
function module bapi_po_change, support packages sapkh46c40, changed delivery date, delivery date, bapi issues, message stating, purchase order, field po_unit, structure poitemx, poitem-po_unit
Related Notes :
| 721984 | BAPI_PO_CHANGE: Item data copied although not wanted |
| 662716 | BAPI_PO_CHANGE/BAdI: Incomplete Sched. |
| 578119 | ME22N: Incorrect quantity after conversion by order unit |