error converting varchar to numeric

protected void Page_Load(object sender, EventArgs e)
      {
          objMember.orderpkstring = Convert.ToString( Session["orderpkstring"]);

          repeater.ItemTemplate = LoadTemplate("~/View/frmOrderJournal.ascx");
          DataSet ds;
          ds = objMember.GetJournalforSub(objMember);
          repeater.DataSource = null;
          if (ds.Tables[0].Rows.Count > 0)
          {
              repeater.DataSource = ds;
              repeater.DataBind();
          }
          else
          {

              ClientScript.RegisterStartupScript(this.GetType(), "Javascript", "javascript:window.close()", true);
              Response.Redirect("frmManageRemitance.aspx");
          }
      }

public DataSet GetJournalforSub(AbstractLayer.baseMember objMember)
       {
           DataSet dsState;
           SqlParameter[] param = new SqlParameter[1];
           // param[0] = new SqlParameter("@JrnlFk", objMember.jrnlpkstring);
           param[0] = new SqlParameter("@journalstring", objMember.orderpkstring);
           dsState = SqlHelper.ExecuteDataset(m_Connection_String, CommandType.StoredProcedure, "proGetJournalForSub", param);
           return dsState;
       }

ALTER procedure [dbo].[proGetJournalForSub]
@journalstring xml
--@Buyr_Id int,
--@PublisherFK int
as
DECLARE @hDoc int
begin
EXEC sp_xml_preparedocument @hDoc OUTPUT,
@journalstring int


SELECT  distinct    dbo.Tbl_ILSM_JournalReg.PK, dbo.Tbl_ILSM_JournalReg.JournalName, dbo.Invoice_Table.JrnlYear, dbo.Invoice_Table.JrnlCur, 
                      dbo.Invoice_Table.price, dbo.Invoice_Table.postage, dbo.Invoice_Table.DisOnClient, dbo.Invoice_Table.DisOnTitle, dbo.Invoice_Table.FinalPrice, 
                      dbo.Invoice_Table.Buyr_Id, dbo.Invoice_Table.pk AS invpk, dbo.Invoice_Table.JournalType, dbo.Tbl_ILSM_JournalReg.PublisherFK, 
                      dbo.Tbl_ILSM_Publisher.Discount, dbo.Tbl_ILSM_Publisher.FixDiscount,Tbl_ILSM_Publisher.PublisherName,
                      Invoice_Table.Invoice_No, C.CustomerName,q.InvoiceJrnlFK,q.SubOrderId,q.Currency,q.PCurrency,
q.ConversonType,
convert(varchar(10), q.ConversonDate,103) as ConversonDate ,Invoice_Table.YearSubscr,q.CurrencyID,q.RemettanceNO,
case 
when Invoice_Table.JournalType='PR' then
JY.PrIntPrice
when Invoice_Table.JournalType='PO' then
JY.IntPrice
when Invoice_Table.JournalType='ON' then
JY.OnIntPrice
end
as JrnlPrice,
case 
when Invoice_Table.JournalType='PR' then
JY.PrIntPostage
when Invoice_Table.JournalType='PO' then
JY.IntPostage
when Invoice_Table.JournalType='ON' then
''
end
as JrnlPostage

					FROM         dbo.Invoice_Table INNER JOIN
                      dbo.Tbl_ILSM_JournalReg ON dbo.Invoice_Table.JournalFK = dbo.Tbl_ILSM_JournalReg.PK INNER JOIN
                      dbo.Tbl_ILSM_Publisher ON dbo.Tbl_ILSM_JournalReg.PublisherFK = dbo.Tbl_ILSM_Publisher.PK
                      inner join tbl_ilsm_customer C on C.pk=Invoice_Table.Buyr_Id
                      inner join tbl_ilsm_jrnl_yrrt JY on JY.journalfk=Tbl_ILSM_JournalReg.pk 
                      and JY.[year]=Invoice_Table.JrnlYear 
                      inner join 
                      (SELECT InvoiceJrnlFK,JournalFK,CustomerPK,SubOrderId,PCurrency,Currency,ConversonType,ConversonDate,CurrencyID,
                      RemettanceNO
                       

FROM OPENXML(@hdoc, 'DocumentElement/dtJournal',3)
WITH (InvoiceJrnlFK int,
JournalFK int,
CustomerPK int,
SubOrderId varchar(100),
PCurrency varchar(10),
Currency varchar(10),
ConversonType varchar(10),
ConversonDate varchar(30),
CurrencyID int,
RemettanceNO varchar(50)

)) q

on q.CustomerPK=Invoice_Table.Buyr_Id and q.JournalFK=Invoice_Table.JournalFK and 
q.InvoiceJrnlFK=Invoice_Table.pk
                      --inner join tbl_ilsm_recipt_amount RA on RA.FK_Inv_id=Invoice_Table.PK
WHERE     (dbo.Invoice_Table.statusofjournal = 'suborder')
--and dbo.Invoice_Table.Buyr_Id=@Buyr_Id and dbo.Tbl_ILSM_JournalReg.PublisherFK=@PublisherFK





end