Bug in SAPbobsCOM.Recordset.GetAsXML()?

Question

I am using the following code:
string query =
        "SELECT BoxCode as stBoxcode, (CASE WHEN TaxCode = 'B' THEN BaseAmount ELSE Debit + Credit END) AS Amountx " +
        "FROM (SELECT VatTaxBox.BoxCode, VatTaxBox.TaxCode, SUM(dbo.JDT1.Basesum * VatTaxBox.FSign) as BaseAmount, SUM(dbo.JDT1.Debit * VatTaxBox.FSign) AS Debit, SUM(dbo.JDT1.Credit * VatTaxBox.FSign) AS Credit " +
        "FROM  dbo.JDT1 INNER JOIN dbo.OJDT ON dbo.JDT1.TransId = dbo.OJDT.TransId " +
        "INNER JOIN dbo.OVTG ON dbo.JDT1.VatGroup = dbo.OVTG.Code " +
        "inner join (SELECT  (CASE WHEN BOXx IS NULL THEN VatBoxes.Boxcode ELSE BOXx END) AS BoxCode, VATMember, FormulSignx * FormulSign as FSign, OBOX.summayfld AS TaxCode " +
        "FROM (SELECT TOP 100 PERCENT B11.BoxCode AS BOXx, B0.boxcode, B0.BoxMember, B0.VATMember, isnull((select (case when formulSign='M' then -1 else +1 END) as FSignX from box1 b1 " +
        "where b1.boxcode=B0.boxcode and b1.SeqNum = B0.Seqnum-1), +1) AS FormulSignx, isnull((select (case when formulSign='M' then -1 else +1 END) as FSignX from box1 b1 " +
        "where b1.boxcode=B11.boxcode and b1.SeqNum = B11.Seqnum-1), +1) AS FormulSign " +
        "FROM BOX1 B0 LEFT OUTER JOIN BOX1 B11 ON B0.BoxCode = B11.BoxMember " +
        "WHERE (NOT (B0.VATMember IS NULL)) ORDER BY B11.BoxCode, B0.BoxCode, B0.SeqNum) AS VatBoxes " +
        "INNER JOIN OBOX ON VatBoxes.boxcode = obox.boxcode) as VatTaxBox ON JDT1.VatGroup = VatTaxBox.VATMember " +
        "WHERE (dbo.OJDT.RefDate >= '2005/01/01') AND (dbo.OJDT.RefDate <= '2005/07/01') AND OJDT.Series = 4 GROUP BY VatTaxBox.BoxCode, VatTaxBox.TaxCode ) as ResultSet ";
      SAPbobsCOM.Recordset rs = (SAPbobsCOM.Recordset)_sapCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.BoRecordset);
      try
        rs.DoQuery(query);
        int i = rs.RecordCount;
        int j = i++;
        string s = rs.GetAsXML(); //-> throws an error: "External component has thrown an exception."
      catch (Exception ex)
        System.Windows.Forms.MessageBox.Show(ex.ToString());
The statement rs.GetAsXML() throws an exception. However when I use a simpler query everything works fine.
What am I doing wrong?
Jurgen

Answer 1

I don't specifically, but one trick I've learned of is to "hide" complex SQL queries in functions or stored procedures.  SBO sometimes has problems with complex SQL queries.  They're aware of this, but until it's fixed, try putting that "monster" in a function or a view. 
Hope that helps.