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This function shows how to get the history of a purchase order to find out which part of the quantity has already been received.

[C#]

public Decimal GetPODetail(string BestellNr, string BestellPos)
{
     
    RFCFunction func = Con.CreateFunction("BAPI_PO_GETDETAIL");
    func.Exports["PURCHASEORDER"].ParamValue = BestellNr;
    func.Exports["HISTORY"].ParamValue = "X";
    func.Exports["ITEMS"].ParamValue = " ";
    func.Execut e();
  
     // Check Return-Table
    for(int i=0; i < func.Tables["PO_ITEM_HISTORY_TOTALS"].RowCount; i++)
    {
        if (func.Tables["PO_ITEM_HISTORY_TOTALS"].Rows[i,"PO_ITEM"].ToString().Equals(BestellPos))
        {
            return (decimal)func.Tables["PO_ITEM_HISTORY_TOTALS"].Rows[i,"DELIV_QTY"];
        }
    }
    return 0;
}