Solution : https://service.sap.com/sap/support/notes/668239 (SAP Service marketplace login required)
Key words :
function module bapi_po_create1, schedule line date, schedule lines, delivery date, purchase order, item structure, reference document, quotation/quotation, purchase requisition, scheduled quantity
Related Notes :
| 556797 | ENJOY-BAPI Purchase order:Schedule line data not transferred |