Get sales all order in invoice

while select OrigSalesId from _CustInvoiceTrans2
     group by _CustInvoiceTrans2.OrigSalesId
                 where 
                _CustInvoiceTrans2.SalesId == _custInvoiceJour.SalesId


{
  salesInvoiceHeaderFooterTmp.SalesIds += _CustInvoiceTrans2.OrigSalesId +'/ ';
}